Exam 3B, Spring 2001

1. Complete and balance the following reactions:

(a) C₅H₅N(aq) + H₂O(l)

(b) C₅H₅N(aq) + HCl(aq)

(c) Co²⁺(aq) + H₂O(l)

(d) Ca(OH)₂(aq) + HF(aq)

(e) H₃PO₄(aq) + CaI₂(aq)

(f) NO₂^–(aq) + H₂O(l)

(g) C₆H₅NH₂(aq) + HOCl(aq)

2. What is the pH of a 0.0052 M solution of methylamine, CH₃NH₂, at 25 °C?

3. Indicate whether the following salts are acidic, basic, or neutral.

(a) NaNO₃

(b) Ca(C₂H₃O₂)₂

(c) KHSO₄

(d) Co(OH)₂

(e) CsNO₂

4. A buffer is prepared that is 0.40 M boric acid, H₃BO₃, and 0.50 M sodium dihydrogen borate.

(a) What is the pH of the buffer at 25 °C?

(b) 0.05 moles of perchloric acid is added to 1.0 L of the buffer prepared in part (a). What is the new pH?

5. Which is more soluble at 25 °C, magnesium fluoride or lithium phosphate?

Answers