The OH- increases the pH of Na3PO4, rendering the solution alkaline. What acid and what strong base would react in aqueous solution to produce the following salts in the formula equation? The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. mol = MxL Clear up mathematic problem If you're having trouble solving a math problem, try breaking it down into smaller pieces and solving each part separately. copyright 2003-2021 Study.com. Ksp = 1.08 1023 [Ca2+]3[P O3 4]2 And if we let S = solubility of calcium phosphate .then clearly [Ca2+] = 3S, and [P O3 4] = 2S .and if we substitute these values back into the solubility expression.. Ksp = 1.08 1023 [Ca2+]3[P O3 4]2 = (3S)3(2S)2 = 108S5 . solvent solute A substance that conducts electricity when dissolved in water is called a (n) ; whereas a substance that does not conduct electricity in aqueous solution is a (n) . a) 8.10% b) Write a balanced equation for the reaction. eNotes Editorial, 19 Oct. 2012, https://www.enotes.com/homework-help/what-balanced-dissociation-equation-k-3po-4-what-365679. A) potassium perchlorate B). 8.11: Ionic Equations is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. Write ionic equations for chemical reactions between ionic compounds. Write a net ionic equation to show that methylamine, CH3NH2, behaves as a Bronsted-Lowry base in water. 4) When dissolved calcium hydroxide reacts with sulfuric acid (H 2 SO 4), a Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. Mg(s) + Co2+ (aq) --> Mg2+ (aq) + Co(s) 3) Nonmetals usually have negative oxidation numbers How will this affect thefreezing point of the water?Assume thesodium chloride completely dissociates in the water.Given: density of water at 35 C = 0.994 g/mLKf water = 1.86 C kg/mol. See also: How Many Ml Of A 0.155 M Kcl Solution Contain 2.55 G Kcl? Therefore 2.25 mol of {eq}\rm K^+{/eq} ions and 0.75 mol of {eq}\rm PO_4^{3-}{/eq} ions are formed. d) If the sample had a mass of 0.8890 g, what is the percentage of iron in the sample? Write the net Bronsted equation and determine the equilibrium constant for the acid-base reaction that occurs when aqueous solutions of formic acid and sodium nitrite are mixed. Write the dissociation equation for phosphoric acid. a) Sodium Carbonate, Na2CO3 Include physical states. Fe2+ (aq) + 2Cl- (aq) + Mg(s) --> Fe (s) + Mg2+ (aq) + 2Cl- (aq) Todd Helmenstine is a science writer and illustrator who has taught physics and math at the college level. Write an equation that represents the action in the water of hydroarsenic acid (H_3 As) as a Bronsted Lowry acid. = 28571.4 mL KCN is a simple ionic compound that is soluble in water to about 50 g/l @25C - stable stewartt8 stewartt8 04/12/2018 Chemistry College Complete this equation for the dissociation of K3PO4(aq). Water-soluble potassium phosphate, K3P O4 K 3 P O 4, also produces a basic solution. L = mol/M Get your answers by asking now. Predict qualitatively whether the salts below dissolve to give solutions that are acidic, basic or neutral. For single-replacement and double-replacement reactions, many of the reactions included ionic compoundscompounds between metals and nonmetals, or compounds that contained recognizable polyatomic ions. mol H2SO4 = Do both, just one, or neither of the following solutions conduct electricity? Strona gwna / Uncategorized / does mountain dew zero sugar raise blood sugar Write an equation that represents how dihydrogen phosphate ion (H_2PO_4^-) behaves as an Arrhenius acid. A) Sr^{2+}. c) 3.91 x 10^-2 M d) O = 6-, Na = 2+, S = 4+ Write an equation that represents the action in the water of piperidine ((CH_2)_5NH) as a Bronsted -Lowry base. d) sodium What is the compound name of the formula? Rank the solutions in order of increasing electrical conductivity, knowing that the greater the number of ions in solution, the greater the conductivity. b) S = 0 If it is not neutral, explain your choice by writing a balanced net ionic equation to describe its behavior in water. Now he has regrets. Helmenstine, Todd. 3H+ (aq) + 3 OH- (aq) --> 3 H2O (l). as represented by the net ionic equation above. "what is thebalanced dissociation equation for K^3PO^4? Predict whether an aqueous solution of KOH would be acidic, basic, or neutral. At the same time, the MgSO4 is a very different substance than Mg 2+ and SO4 2-.If you need to know how to balance chemical reactions, see my complete tutorial on balancing all types of chemical equations:Balancing Equations in 5 Easy Steps: https://youtu.be/zmdxMlb88FsMore Practice Balancing: https://youtu.be/Qci7hiBy7EQDrawing/writing done in InkScape. When a metal corrodes, each metal atom loses one or more electrons to form a cation, The substance that lost one or more electrons, How many electrons does each oxygen atom gain during the course of this reaction? I. Hydrogen ion II. This means that over a period of about two billion years, the Colorado River carved rock from the surface by slowly dissolving it, eventually generating a spectacular series of gorges and canyons. mol = M x L Salt water. Provide multiple forms There are many different ways to fill out a form. The van 't Hoff factor, i, is a constant associated with the amount of dissociation of the solute in the solvent. If this solution were mixed with the one pictured above for HY, what species would be present in a diagram that represents the combined solutions after any possible reaction? The volume of acid would have to be doubled, so that stoichiometrically everything reacts. a) 1.75 mL Na2SO4(s) + aq ? There are a series of common solubility rules that chemists memorize, but solubility charts can be consulted as well. Phosphoric acid, one of the acids used in some cola drinks, is produced by the reaction of phosphorus(V) oxide, an acidic oxide, with water. then HSO4 --> H+ + SO4 2-. "Freezing Point Depression Example Problem." Freezing point depression calculations apply to dilute solutions. Thus, when CaCl2 dissolves, the one Ca2+ ion and the two Cl ions separate from one another: \[CaCl_{2}(s)\overset{H_{2}O}{\rightarrow}Ca^{2+}(aq)+Cl^{-}(aq)+Cl^{-}(aq)\nonumber \], \[CaCl_{2}(s)\overset{H_{2}O}{\rightarrow}Ca^{2+}(aq)+2Cl^{-}(aq)\nonumber \]. b. Upvote 1 Downvote Add comment Report Still looking for help? The equation is already balanced. Get a free answer to a quick problem. c) the net ionic equation. c) Pb(NO3)2 (aq) and Fe(NO3)2 (a) 1. Is a 0.1 M solution of NaHCO3 acidic, basic, or neutral? Potassium has positive charge (+1), compound has neutral charge. Nonelectrolyte = C2H5OH, Which of these substances, when dissolved in water, is a strong electrolyte? For example, you can dissolve a maximum of 36.0 g of NaCl in 100 g of water at room temperature, but you can dissolve only 0.00019 g of AgCl in 100 g of water. What weak acid is made? Hydrogen sulfide is composed of two elements: hydrogen and sulfur. NH3 + HCl also gives NH4Cl right ( 1 vote) Flag Shivani The CO_3 ion is the conjugate base of the HCO_3^- ion. Write a net ionic equation to show that aniline, C_6H_5NH_2, behaves as a Bronsted-Lowry base in water. Solubility rules are very useful in determining which ionic compounds are dissolved and which are not. Write the balanced molecular and net ionic equations for the reaction of aluminum with hydrobromic acid. Anions containing hydrogen (for example, HCO_3^- and H_2PO_4^2-) show amphoteric behavior when reacting with other acids or bases. All ionic compounds that dissolve behave this way. c) SCl2 Predict whether aqueous solutions of the following substances are acidic, basic, or neutral. Question: Sodium Carbonate Dissolved In Water Produces A Basic Solution.Water-soluble Potassium Phosphate, K3PO4,also Produces A Basic Solution. They become dissociated ions in their own right. (8.1x10^-3 g/0.01 g) = 81% Write the equation for the neutralization of lemon juice (citric acid) with baking soda (sodium hydrogen carbonate or sodium bicarbonate) that shows a proton transfer to form carbonic acid and a salt. Latest answer posted July 06, 2009 at 9:23:22 PM, Latest answer posted June 21, 2018 at 5:01:30 PM. Assign an oxidation state to phosphorus in each of the following: (a) NaH2PO3 (b) PF (c) P4O6 (d) K3PO4 (e) Na3P (f) Na4P2O7 78. 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(Use H3O+ instead of H.) Is the solution acid, basic, or neutral? A positive or negative whole number assigned to an element in a molecule or ion on the basis of a set of formal rules: The dissociation of 1 mole of K3PO4forms 3 moles of potassium ions (K^+) and 1 mole of phosphate ions (PO4^-3). Liters of soln = (mol of x) x (1 L soln/mol of x) Justify by writing out any pertinent chemical reaction that shows how it contributes to its acidity or basicity. What does thi. ex: each H atom in H2 has an oxidation number of 0 Write the chemical equation of mixing carbonate (CO_3^{2-}), which is a base, with water. This is more representative of what is occurring in the solution. b) (0.0072/10 g) x 100 = 0.716 %, A mysterious white powder is found at a crime scene. Kuta Software - Infinite Algebra 2 Rational Exponent Equations Answers, . Potassium has positive charge (+1), compound has neutral charge. b) Barium Nitrate, c) NaOH Is Z n S O 4 in aqueous solution acidic or basic? NBA star suspended for assault rifle incident, Mortgage rates up to highest level in months, Biden orders U.S. airstrike against Iran-backed militia, Lady Gaga's dog walker shot, 2 French bulldogs stolen. When calculating the amount of ions formed when an ionic compound is dissolved in water, it is important to determine if it is soluble or not. {/eq}) which is a weak acid. An ion in solution is displaced (replaced) through oxidation of an element Justify by writing out any pertinent chemical reaction that shows how it contributes to its acidity or basicity. 125 mL x (1 L/1000 ml) = 0.125 L Ba(NO3)2 + 2 KOH ->Ba(OH)2 + 2 KNO3 Write the acid dissociation equation for the dissociation of the weak acid H_2PO_4^- in water. M=mol/L Chemistry. answered 02/12/20, Experienced Chemistry Tutor and College Lecturer. e) 3.35 M, M=mol/L 4, An example, using ammonia as the base, is H 2 O + NH 3 OH + NH 4 +. c) 1:1 a) ammonia b) when NiCl2 (aq) is added to a test tube containing Zu(NO3)2 (aq)? Write the formula for the hydronium ion. Therefore a total of 4 ions are formed from the dissociation of 1 mole of K 3 PO 4 . electrolyte nonelectrolyte Acids and bases can be defined in terms of their behavior in aqueous solution. 31.65 g of sodium chloride is added to 220.0 mL of water at 34 C. Mg (s) + CoSO4 (aq) --> MgSO4 (aq) + Co(s) 0.0277 mol/0.1 L = 0.277 M. What is the molar concentration of each ion present in a 0.025 M aqueous solution of calcium nitrate? b) 3H+ + PO3- + 3K+ + 3 OH- --> 3K+ + PO3 - + 3H2O (l) Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. The basicity of tetraoxosulphate(IV) acid is 2. M = mol/L 1) sodium hydrogen carbonate 2) potassium dihydrogen phosphite 3) lithium hydrogen oxalate Three different aqueous solutions are made at 25 c, each containing one of the amphoteric salts below. Such salts are a result of partial or incomplete neutralization. The quantity of Cl- in a municipal water supply is determined by titrating the sample with Ag+. ONLY metals ABOVE hydrogen in the activity series are ABLE TO REACT WITH ACIDS TO FORM H2 d) LiNO3 (aq) + Na3PO4 (aq) -->, The amount of a substance that dissolves in a given quantity of solvent at a given temperature to form a saturated solution c) Cl = 2-, S = 2+ 275.0 mL x (1 L/1000 ml) = 0.275 L Consider solutions in which 0.1 mol of each of the following compounds is dissolved in 1 L of water: Ca(NO3)2, C6H12O6, NaCH3COO, and CH3COOH. 2 NaOH + H2SO4 --> Na2SO4 + 2 H2O Write an equation for the acid-base reaction that takes place when bicarbonate ion is added to a solution containing hydroxide ion. b. Traditions Outfitter G2 35 Rem Review, That is, it can act like a Bronsted-Lowry acid or as a Bronsted-Lowry base. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo). Welcome! = 0.210 M NaOH. Will the solution be acidic, neutral, or basic? e) 39.0 mg, Na2S (s) + Cd(NO3)2 (aq) --> CdS (s) + 2 NaNO3 (aq) e) 28,570 mL, M1V1 = M2V2 When it is in the solution it forms ions. Ca(NO3)2 Video \(\PageIndex{1}\): Mixing Potassium Chromate and Silver Nitrate together to initiate a precipitation reaction (Equation \(\ref{4.2.1}\)). NH3+ + 3H+ --> NH4+ + H2O Why don't things melt when we touch them? 4) The sum of oxidation numbers in all neutral compounds is 0. mol = )0.500 Na2SO4) x (0.350 L Identify all of the phases in your answer. Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of calcium chloride and sodium carbonate are mixed. By using this website, you signify your acce Balance the reaction of KOH + H3PO4 = K3PO4 + H2O using this chemical equation balancer! Answer: B, a) How many grams of NaOH are needed to neutralize 20.0 mL or 0.150 M H2SO4 solution? When K3PO4 is dissolved in water, why does the solution turn basic? In fact, this is only one possible set of definitions. (c) What is the molarity of the phosphate anion? K_ {sp} = 9 times 10^ {-28}. A reaction that occurs between substances in solution in which one of the products is insoluble, An insoluble solid formed by a reaction in solution, Which reaction will result in formation of a precipitate? d) 0.325 M Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent. Answer Save. Fe2+ (aq) + Mg (s) --> Fe (s) + Mg2+ (aq), Which of these metals is the easiest to oxidize? 3 AgNO3 (aq) + K3PO4 (aq) --> Ag3PO4 (s) + 3 KNO3 (aq) 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning, a Question B) Hydrosulphuric acid, H2S. Check image Most questions answered within 4 hours. The subscripts in the chemical formula of the compound can be used to determine the relative ion concentrations a) 0.0444 M 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in . The balanced chemical equation is: K3PO4 (aq)+AlCl3 (aq) 3KCl (aq)+AlPO4 (s) Aqueous potassium phosphate reacts with aqueous aluminum chloride to form aqueous potassium chloride and solid aluminum phosphate. Now mL to L Write the ions present in a solution of k3po4. Zn + 2 HBr --> ZnBr2 + H2 Freezing Point Depression Example Problem. In this video we will describe the equation K3PO4 + H2O and write in H2O (water) it will dissociate (dissolve) into K+ and PO4 3- ions. Thank you so much! Further, to describe the chemical conte (determinant of how acidic or basic a substance is) P.S, H+ (aq.) M1V1 = M2V2. what is the name of formula? a. HF. What is more dangerous, biohazard or radioactivity? Predict the pH of the following salt solutions and report as either acidic, basic, or neutral. Write the net ionic equation for the dissociation reaction that occurs when solid potassium phosphate dissolves in water: Use the pull-down boxes to specify states such as (aq) or (s). B. Ionic compounds that dissolve separate into individual ions. The water molecules surrounded each ion in the solid NaCl separating the Na+ ions from the Cl- ions. Explain your choice by showing the reaction of the acid/base with water. mol = 0.100 M Ag+ x 0.0202 L = 0.00202 mol Ag+ \[\ce{CaCl2(aq) + Pb(NO3)2(aq) Ca(NO3)2(aq) + PbCl2(s)}\nonumber \], Ca2+(aq) + 2Cl(aq) + Pb2+(aq) + 2NO3(aq) Ca2+(aq) + 2NO3(aq) + PbCl2(s), You may notice that in a complete ionic equation, some ions do not change their chemical form; they stay exactly the same on the reactant and product sides of the equation. In water potassium phosphate, ionic compound, dissociates on positive potassium ion (cations) and negative phosphate ions (anions). For each, write a balanced equation for their dissociation in water. 15 ml = 0.015 L The solute must be present in much lower quantities than the solvent. What ions does it form? 23.4 g Na2SO4 x (1 mol Na2SO4/142.04 g Na3SO4) = 0.165 mol Na2SO4 However, CaCO3 has the relatively unusual property of being less soluble in hot water than in cold water. What Is The Ph Of A Saturated Solution Of Zn(Oh)2? Limiting reagent is AgNO3 Equation for Potassium Sulfate Dissolving in Water (K2SO4 + H2O ) Wayne Breslyn 631K subscribers Subscribe 301 55K views 4 years ago In this video we will describe the equation K2SO4 + H2O and. Latest answer posted September 19, 2015 at 9:37:47 PM. Write a chemical equation to justify your choice. b) (5.0 M)(V1) = (0.10M)(250 mL) M=mol/L . Predict whether an aqueous solution of Na2CO3 would be acidic, basic, or neutral. The dissociation equation when the compound is dissolved in water is as follows: {eq}\rm K_3PO_4 (s) \rightarrow 3K^+ (aq) + PO_4^ {3-} (aq) {/eq}. M=mol/L Magnetoplasma and Cyclotron Phenomena in the High-Temperature X-Band Electron Paramagnetic Resonance Spectra of Graphite. D) no solid product is formed. Determine the net Bronsted acid-base equation for the reaction that occurs when aqueous solutions of HNO2 and NaOH are mixed. c) 48.6 mL 0.175 mol Na2SO4 x (142.04 g/ 1 mol Na2SO4) = 24.9g Na2SO4, What is the concentration of ammonia in a solution made by dissolving 3.75 g of ammonia in 120.0 L of water? Log in here. c) O = 2-, Cr = +6 Write net ionic equations for chemical reactions between ionic compounds. Sciences, Culinary Arts and Personal We can define acids as substances that dissolve in water to produce H + ions, whereas bases are defined as substances that dissolve in water to produce OH ions. b) S8 Telefon: +40 21 212 86 07 At the same time, the K2SO4 is a very different substance than K+ and SO4 2-.If you need to know how to balance chemical reactions, see my complete tutorial on balancing all types of chemical equations:Balancing Equations in 5 Easy Steps: https://youtu.be/zmdxMlb88FsMore Practice Balancing: https://youtu.be/Qci7hiBy7EQDrawing/writing done in InkScape. = 5.0 mL b) 17.3% c. NH_4ClO_2. How many moles of hydrogen gas would be produced for every mole of magnesium added into the HCl solution? A net ionic equation to show that hydrofluoric acid behaves as a Bronsted-Lowry base in water: [{Blank}] (aq,l,s,g) + H2O \rightarrow [{Blank}] (aq,l,s,g) + [{Blank}] (aq,l,s,g), Use the following salts to create a 0.100 M solution. Solved Complete this equation for the dissociation of K3PO4. Once the ionic solid has dissolved, the anion that is formed is able to react as a base, with water as the acid. To show that they are dissolved in water we can write (aq) after each. = 0.00504 mol H2SO4 In this video we will describe the equation MgSO4 + H2O and write what happens when MgSO4 is dissolved in water.When MgSO4 is dissolved in H2O (water) it wil. We can use a chemical equation to represent this processfor example, with NaCl: \[\ce{ NaCl(s) ->[\ce{H2O}] Na^{+}(aq) + Cl^{-}(aq)}\nonumber \]. \[\cancel{K^{+}(aq)}+Br^{-}(aq)+Ag^{+}(aq)+\cancel{C_{2}H_{3}O_{2}^{-}(aq)}\rightarrow K^{+}(aq)+\cancel{C_{2}H_{3}O_{2}^{-}(aq)}+AgBr(s)\nonumber \], \[\cancel{Mg^{2+}(aq)}+SO_{4}^{2-}(aq)+Ba^{2+}(aq)+\cancel{2NO_{3}^{-}(aq)}\rightarrow Mg^{2+}(aq)+\cancel{2NO_{3}^{-}(aq)}+BaSo_{4}(s)\nonumber \], CaCl2(aq) + Pb(NO3)2(aq) Ca(NO3)2(aq) + PbCl2(s). Write out the chemical equation for the equilibrium hydrolysis reaction of the hydrogen phosphate ion for both acid. Calculating freezing point depression has practical applications, such as making ice cream and drugs and de-icing roads. A homogeneous mixture of two or more substances, The dissolving medium of a solution; it is normally the component of a solution present in the greater amount, A substance dissolved in a solvent to form a solution; this is normally the component present in the smaller amount, A solute that produces ions in solution; an Electrolytic solution conducts an electric current, A substance that not ionize in water and consequently gives a nonconducting solution. Net Ionic: b) H normally is +1 unless bonded to a metal so it equals -1 M = mol/L a) How many moles of MnO4 (1-) were added to the solution? Read the definition of salt hydrolysis, examples of salt hydrolysis, and how to determine the pH of salts including the formula. Hydrogen Sulfide, which is the substance that gives off the rotten egg odor, Happens in metal Join Yahoo Answers and get 100 points today. When a solute is added to a solvent, its freezing point is lowered from the original value of the pure solvent. to do this: Divide by the volume you have (250) and time by the volume that you want to express the answer as(1000 mls = 1 litre - just converting betwwen units effectively): = (0.450 mol / 250 ml) x 1000 ml = 1.8 mol L-1. The solubility of the salts was derived from conductimetry and DSC measurements. Alkali salts are basic salts are that category of salts which are formed by combination of strong bases and weak acids. Find an answer to your question Complete this equation for the dissociation of K3PO4(aq). This precipitate, called limescale, can also contain magnesium compounds, hydrogen carbonate compounds, and phosphate compounds. d) Both Chloric Acid and Hydrobromic Acid of 1) Monoatomic ions - oxidation number is the same as the charge Make sure that the reaction is consistent with the measured pH. a) HCl + H2O -> Cl- + H2O + H+ When molecular compounds, such as sugar, dissolve in water, the individual molecules drift apart from each other. = 0.00183 or 1.83x10^-3 M a) Cobalt(II) Hydroxide While full chemical equations show the identities of the reactants and the products and give the stoichiometries of the reactions, they are less effective at describing what is actually occurring in solution. The NaOH concentration is normally 3 to 6 M, and the solution must be analyzed periodically. In the present study, Lobularia maritima (Lm) flavonoid extract (LmFV) was characterized by HPLC analyses and five compounds were detected. In a coffee cup calorimeter, 1.60 g of NH4NO3 is mixed with 75.0 g water at an initial temperature of 23.50 C. Domestic water frequently contains small amounts of dissolved ionic compounds, including calcium carbonate (CaCO3). Potassium Phosphate is an inorganic compound used as a laxative, dietary supplement and for electrolyte-replacement purposes. a) the balanced molecular equation, c) 1.84 M Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of silver nitrate and potassium phosphate are mixed. c) If 10.0 mL of a 10.0 M stock solution of NaOH is diluted to 250 mL, what is the concentration of the resulting stock solution? Legal. Hydroxide ion a. I and II b. I, II, and III c. I and IV d. I and II. The first H+ comes off at once. Is OH amphiprotic in an aqueous solution? For those cations that are acidic, write an equation that shows how the cation acts as an acid. c) H2SO4 of 1.00 M x 500.0 mL = 1.75x10^2 M x (V 2) d) 7.42x 10^-5 M C) Cu3 (PO4)2. = 0.00025 mol Cd(NO3)2 Interestingly, his PhD examination team had a hard time believing that ionic compounds would behave like this, so they gave Arrhenius a barely passing grade. 0.195 g x 1000 = 19.5 mg Services, Solubility in Chemistry: Definition & Properties, Working Scholars Bringing Tuition-Free College to the Community. Which of the following is a strong electrolyte? to some degree it reflects the positive or negative character of that atom a) 13.8 mg Express your answer as an ion. Ca(OH)2 + 2 HNO3 --> Ca(NO3)2 + 2 H2O Na_2CO_3. 3.58 g b) Write the balanced chemical equation for the reaction, BaCl2 + K2SO4 -> BaSO4 (s) + 2 KCl (a) What is the molarity of K3PO4? d) 57.1 mL The structural formula of citric acid, a main component of citrus fruits, is (see image) The equation for K3PO4 is:H3PO4 + KOH = K3PO4 + H2OIt is also useful to have memorized the common strong acids and bases to determine whether K3PO4 acts as an acid or base in water (or if it forms a neutral solution).Strong acids: HCl, H2SO4, HNO3, HBr, HI, HClO4Weak acids: HF, CH3COOH, H2CO3, H3PO4, HNO2, H2SO3Strong Bases: LiOH, NaOH, KOH, Ca(OH)2, Sr(OH)2, Ba(OH)2Weak Bases: NH3, NH4OHNote that we are talking about whether K3PO4 is an acid, base, or neutral when dissolved in water.- Salts of strong bases and strong acids: pH will remain neutral at 7.- Salts of weak bases and strong acids: pH less than 7 (acidic).- Salts from strong bases and weak acids: pH greater than 7 (alkaline).Based on these rules, the solution of K3PO4 dissolved in water is Basic.For polyprotic acids (e.g. H+ and OH- form when the chemicals dis-associate in water.