Exam 3A, Spring 1999

1. Complete and balance the following reactions:

a. HCO₃^–(aq) + H₂O(l)

b. HPO₄^2–(aq) + NaOH(aq)

c. Fe(NO₃)₂(aq) + H₂O(l)

d. Mn(NO₃)₂(aq) + KOH(aq)

e. CaCl₂(aq) + H₂SO₄(aq)

f. AgNO₃(aq) + NaCN(aq)

2. On the titration curve shown, give estimates for the following: the pH at the equivalence point, the equivalence volume, and the pK_a.

3. Consider a 0.35 M solution of aniline, C₆H₅NH₂, at 25 °C.

a. What is the pH of the solution?

b. What is the pH of the solution if enough anilinium hydrobromide, C₆H₅NH₃Br, is added so that the anilinium ion concentration becomes 0.35 M?

4. Consider cadmium hydroxide at 25 °C.

a. What is the molar solubility in pure water?

b. What is the molar solubility in 1.0 M Cd(NO₃)₂ solution?

c. What is the molar solubility in 1.0 M NH₃ solution?

5. You are given 1.0 M solutions of sodium dihydrogen phosphate and sodium hydrogen phosphate. How many mL of each solution are required to prepare 100.0 mL of a buffer with pH = 7.00 at 25 °C.

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