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17.96 The Common-Ion Effect movie (eChapter 17.1) shows the solubility of an iodide salt being reduced by the addition of sodium iodide. (a) How would you expect the solubility of the salt to be affected by the addition of a strong acid? (b) How would you expect it to be affected by the addition of a strong base? Explain your reasoning for both answers.

17.97 (a) Using data from the Calculating pH Using the Henderson–Hasselbalch Equation activity (eChapter 17.2), determine the pK_a of benzoic acid (C₆H₅CO₂H). (b) Using the pK_a that you determined in part (a), calculate the pH of a 0.0015 M aqueous solution of benzoic acid. (c) Will the pH of the solution in part (b) change if it is diluted with water to twice its original volume? Explain. (d) Will the pH of a buffer change when it is diluted with water to twice its original volume? If not, explain why not.

17.98 In Exercise 17.15 you calculated the pH of a buffer prepared by adding 20.0 g each of acetic acid and sodium acetate to enough water to make a 2.00-L solution. (a) Use the Calculating pH Using the Henderson–Hasselbalch Equation simulation (eChapter 17.2) to prepare this buffer and verify your answer to Exercise 17.15. (b) Describe what is meant by the term buffer capacity. (c) Of which could you add more to the above buffer without causing a drastic change in pH, strong acid or strong base?

17.99 The Dissolution of Mg(OH)₂ by Acid animation (eChapter 17.5) shows how the relatively insoluble solid, Mg(OH)₂, can be made more soluble in water by the addition of acid. (a) Write the net ionic equation for the process by which magnesium hydroxide dissolves in neutral water. (b) Write the net ionic equation for the combination of two hydronium ions with two hydroxide ions. (c) Show that the net ionic equations in parts (a) and (b) add to give the overall net ionic equation shown in the animation. (d) Calculate the equilibrium constant for the process represented by the overall net ionic equation (i.e., dissolution of magnesium hydroxide in aqueous acid). (e) Determine the solubility of magnesium hydroxide in 0.010 M HCI.