Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Chapter 13, Problem 57QAP
Chromic acid, H2CrO4, is commonly obtained by adding concentrated H2SO4 to a dichromate. It is used to clean glass. For chromic acid, Ka is
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Chapter 13 Solutions
Chemistry: Principles and Reactions
Ch. 13 - For each of the following reactions, indicate the...Ch. 13 - Follow the direction for Question 1 for the...Ch. 13 - According to the Brønsted-Lowry theory, which of...Ch. 13 - According to the Brønsted-Lowry theory, which of...Ch. 13 - Give the formula of the conjugate acid of (a) OH-...Ch. 13 - Give the formula for the conjugate base of (a)...Ch. 13 - Write a balanced equation showing how the H2PO4-...Ch. 13 - Follow the instructions of Question 7 for the...Ch. 13 - Using the Brønsted-Lowry model, write equations...Ch. 13 - Prob. 10QAP
Ch. 13 - Using the Brønsted-Lowry model, write an equation...Ch. 13 - Prob. 12QAPCh. 13 - Find the pH of solutions with the following[ H+ ]....Ch. 13 - Find the pH of solutions with the following[ H+ ]....Ch. 13 - Calculate H+ and OH- and in solutions with the...Ch. 13 - Calculate [H+] and [OH-] in solutions with the...Ch. 13 - Complete the following table for solutions at 25C.Ch. 13 - Complete the following table for solutions at 25C.Ch. 13 - Solution 1 has [ H+ ]=1.7102 M. Solution 2 has [...Ch. 13 - Solution R has pH 13.42. Solution Q has [ OH...Ch. 13 - Consider three solutions, R, Z, and Q. •...Ch. 13 - Solution A has a pH of 12.32. Solution B has [H+]...Ch. 13 - Unpolluted rain water has a pH of about 5.5. Acid...Ch. 13 - Most cola soft drinks have a pH of 3.1. Green tea...Ch. 13 - Find [OH-] and the pH of the following solutions....Ch. 13 - Find [H+] and the pH of the following solutions....Ch. 13 - Find [OH+], [OH-] and the pH of the following...Ch. 13 - Find [OH-], [H+], and the pH of the following...Ch. 13 - How many grams of HI should be added to 265 mL of...Ch. 13 - What is the pH of a solution obtained by adding...Ch. 13 - What is the pH of a solution obtained by adding...Ch. 13 - What is the pH of a solution obtained by mixing...Ch. 13 - Write the ionization equation and the Ka for each...Ch. 13 - Write the ionization equation and the Ka...Ch. 13 - Calculate Ka for the weak acids that have the...Ch. 13 - Prob. 36QAPCh. 13 - Prob. 37QAPCh. 13 - Consider these acids (a) Arrange the acids in...Ch. 13 - Rank the following solutions in order of...Ch. 13 - Rank the following acids (M=0.10)in order of...Ch. 13 - Prob. 41QAPCh. 13 - Rank the solutions in Questions 40 in order of...Ch. 13 - The pH of a 0.129 M solution of a weak acid, HB,...Ch. 13 - The pH of a 2.642 M solution of a weak acid, HB,...Ch. 13 - Paraminobenzene (PABA), HC7H6NO2, is used in some...Ch. 13 - Acetaminophen, HC8H8NO2 (MM=151.17g/mol), is the...Ch. 13 - Caproic acid, HC6H11O2, is found in coconut oil...Ch. 13 - Barbituric acid, HC4H3N2O3, is used to prepare...Ch. 13 - When aluminum chloride dissolves in water,...Ch. 13 - Using the Ka values in Table 13.2, calculate the...Ch. 13 - Barbituric acid, HC4H3N2O3, is used to prepare...Ch. 13 - Penicillin(MM=356g/mol), an antibiotic often used...Ch. 13 - Gallic acid, HC7H5O5, an ingredient in some...Ch. 13 - Anisic acid (K a=3.38105) is found in anise seeds...Ch. 13 - Phenol, once known as carbolic acid, HC6H5O, is a...Ch. 13 - Benzoic acid (K a=6.6105)is present in many...Ch. 13 - Chromic acid, H2CrO4, is commonly obtained by...Ch. 13 - Consider citric acid, H3C6H5O7, added to many soft...Ch. 13 - Consider a 0.45 M solution of ascorbic...Ch. 13 - Consider a 0.33 M solution of the diprotic acid...Ch. 13 - Phthalic acid H2C8H4O4, is a diprotic acid. It is...Ch. 13 - Selenious acid, H2SeO3, is primarily used to...Ch. 13 - Write the ionization expression and the Kb...Ch. 13 - Follow the instructions for Question 63 for the...Ch. 13 - Prob. 65QAPCh. 13 - Follow the directions of Question 65 for the...Ch. 13 - Using the equilibrium constants listed in Table...Ch. 13 - Using the equilibrium constants listed in Table...Ch. 13 - Find the value of Kb for the conjugate base of the...Ch. 13 - Find the values of Kb for the conjugate bases of...Ch. 13 - Determine [OH-], pOH and pH of a 0.28 M aqueous...Ch. 13 - Determine the [OH-] and pH of a 0.72 M solution of...Ch. 13 - Codeine (Cod), a powerful and addictive...Ch. 13 - Consider pyridine, C5H5N, a pesticide and deer...Ch. 13 - A solution of baking soda, NaHCO3, has a pH of...Ch. 13 - A solution of sodium cyanide, NaCN, has a pH of...Ch. 13 - Write formulas for two salts that (a) contain Ni3+...Ch. 13 - Write formulas for two salts that (a) contain NH4+...Ch. 13 - State whether 1 M solutions of the following salts...Ch. 13 - State whether 1 M solutions of the following salts...Ch. 13 - Write net ionic equations to explain the acidity...Ch. 13 - Prob. 82QAPCh. 13 - Arrange the following aqueous 0.1 M solutions in...Ch. 13 - Arrange the following aqueous 0.1 M solutions in...Ch. 13 - Unclassified At 25C, a 0.20 M solution of...Ch. 13 - Prob. 86QAPCh. 13 - There are 324 mg of acetylsalicylic acid...Ch. 13 - A student is asked to bubble enough ammonia gas...Ch. 13 - Prob. 89QAPCh. 13 - A student prepares 455 mL of a KOH solution, but...Ch. 13 - Consider the process H2O H+(aq)+OH(aq)H=55.8kJ (a)...Ch. 13 - Household bleach is prepared by dissolving...Ch. 13 - A tablet with a mass of 4.08 g contains 71.2%...Ch. 13 - Consider a weak organic base (nonelectrolyte) with...Ch. 13 - Prob. 95QAPCh. 13 - Which of the following is/are true regarding a 0.1...Ch. 13 - Which of the following is/are true about a 0.10 M...Ch. 13 - Consider the following six beakers. All have 100...Ch. 13 - Each box represents an acid solution at...Ch. 13 - Each box represents an acid solution at...Ch. 13 - Prob. 101QAPCh. 13 - You are asked to determine whether an unknown...Ch. 13 - What is the pH of a 0.020 M solution of H2SO4? You...Ch. 13 - Prob. 104QAPCh. 13 - What is the pH of a solution obtained by mixing...Ch. 13 - A solution is made up of 273 mL of 0.164 M HNO3...Ch. 13 - What is the freezing point of vinegar, which is an...Ch. 13 - Prob. 108QAPCh. 13 - Consider two weak acids, HA (MM=138g/mol)and HB...Ch. 13 - Consider an aqueous solution of a weak base, NaB...
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- Write an equation for each of the following buffering actions. a. the response of a HPO42/PO43 buffer to the addition of OH ions b. the response of a HF/F buffer to the addition of OH ions c. the response of a HCN/CN buffer to the addition of H3O+ ions d. the response of a H3PO4/H2PO4 buffer to the addition of H3O+ ionsarrow_forwardWrite the chemical equation and the expression for the equilibrium constant, and calculate Kb for the reaction of each of the following ions as a base. (a) sulfate ion (b) citrate ionarrow_forwardFor conjugate acidbase pairs, how are Ka and Kb related? Consider the reaction of acetic acid in water CH3CO2H(aq)+H2O(l)CH3CO2(aq)+H3O+(aq) where Ka = 1.8 105 a. Which two bases are competing for the proton? b. Which is the stronger base? c. In light of your answer to part b. why do we classify the acetate ion (CH3CO2) as a weak base? Use an appropriate reaction to justify your answer. In general, as base strength increases, conjugate acid strength decreases. Explain why the conjugate acid of the weak base NH3 is a weak acid. To summarize, the conjugate base of a weak acid is a weak base and the conjugate acid of a weak base is a weak acid (weak gives you weak). Assuming Ka for a monoprotic strong acid is 1 106, calculate Kb for the conjugate base of this strong acid. Why do conjugate bases of strong acids have no basic properties in water? List the conjugate bases of the six common strong acids. To tie it all together, some instructors have students think of Li+, K+, Rb+, Cs+, Ca2+, Sr2+, and Ba2+ as the conjugate acids of the strong bases LiOH, KOH. RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2. Although not technically correct, the conjugate acid strength of these cations is similar to the conjugate base strength of the strong acids. That is, these cations have no acidic properties in water; similarly, the conjugate bases of strong acids have no basic properties (strong gives you worthless). Fill in the blanks with the correct response. The conjugate base of a weak acid is a_____base. The conjugate acid of a weak base is a_____acid. The conjugate base of a strong acid is a_____base. The conjugate acid of a strong base is a_____ acid. (Hint: Weak gives you weak and strong gives you worthless.)arrow_forward
- Table 13-4 lists the stepwise Ka values for some polyprotic acids. What is the difference between a monoprotic acid, a diprotic acid, and a triprotic acid? Most polyprotic acids are weak acids; the major exception is H2SO4. To solve for the pH of a solution of H2SO4, you must generally solve a strong acid problem as well as a weak acid problem. Explain. Write out the reactions that refer to Ka1 and Ka2 for H2SO4. For H3PO4, Ka1 = 7.5 103, Ka2 = 6.2 108, and Ka3= 4.8 1013. Write out the reactions that refer to the Ka1, Ka2and Ka3equilibrium constants. What are the three acids in a solution of H3PO4? Which acid is strongest? What are the three conjugate bases in a solution of H3PO4? Which conjugate base is strongest? Summarize the strategy for calculating the pH of a polyprotic acid in water.arrow_forwardIn the following reaction of tetrafluoroboric acid, HBF4, with the acetate ion, C2H3O2, the formation of tetrafluoroborate ion, BF4 , and acetic acid, HC2H3O2 is favored. HBF4+C2H3O2BF4+HC2H3O2 Which is the weaker base, BF4 or acetate ion?arrow_forwardMalic acid is a weak diprotic organic acid with Ka1 = 4.0 104 and Ka2 = 9.0 105. a Letting the symbol H2A represent malic acid, write the chemical equations that represent Ka1 and Ka2. Write the chemical equation that represents Ka1 Ka2. b Qualitatively describe the relative concentrations of H2A, HA, A2, and H3O+ in a solution that is about one molar in malic acid. c Calculate the pH of a 0.0175 M malic acid solution and the equilibrium concentration of [H2A]. d What is the A2 concentrationin in solutions b and c?arrow_forward
- Consider sodium acrylate, NaC3H3O2. Ka for acrylic acid (its conjugate acid) is 5.5 105. (a) Write a balanced net ionic equation for the reaction that makes aqueous solutions of sodium acrylate basic. (b) Calculate Kb for the reaction in (a). (c) Find the pH of a solution prepared by dissolving 1.61 g NaC3H3O2 in enough water to make 835 mL of solution.arrow_forwardIonization of the first proton from H2SO4 is complete (H2SO4 is a strong acid); the acid-ionization constant for the second proton is 1.1 102. a What would be the approximate hydronium-ion concentration in 0.100 M H2SO4 if ionization of the second proton were ignored? b The ionization of the second proton must be considered for a more exact answer, however. Calculate the hydronium-ion concentration in 0.100 M H2SO4, accounting for the ionization of both protons.arrow_forwardPhenol, C6H5OH, is a weak organic acid. Suppose 0.515 g of the compound is dissolved in enough water to make 125 mL of solution. The resulting solution is titrated with 0.123 M NaOH. C6H5OH(aq) + OH(aq) C6H5O(aq) + H2O() (a) What is the pH of the original solution of phenol? (b) What are the concentrations of all of the following ions at the equivalence point: Na+, H3O+, OH, and C6H5O? (c) What is the pH of the solution at the equivalence point?arrow_forward
- Consider all acid-base indicators discussed in this chapter. Which of these indicators would be suitable for the titration of each of these? (a) NaOH with HClO4 (b) acetic acid with KOH (c) NH3 solution with HBr (d) KOH with HNO3 Explain your choices.arrow_forwardAn important component of blood is the buffer combination of bicarbonate ion and carbonic acid. Consider blood with a pH of 7.42. a What is the ratio of [H2CO3] to [HCO3]? b What does the pH become if 15% of the bicarbonate ions are converted to carbonic acid? c What does the pH become if 25% of the carbonic acid molecules are converted to bicarbonate ions?arrow_forwardSodium phosphate, Na3PO4, is an ingredient of some preparations used to clean walls before they are painted. What is the pH of 1.0 M Na3PO4 (aq)?arrow_forward
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