Exam 3B, Spring 2003

1. Complete and balance the following reactions.

a. aqueous sulfuric acid plus solid barium hydroxide

b. C₅H₁₀NH(aq) + HClO₄(aq)

c. C₂H₅NH₂(aq) + H₂O(l)

d. Mg(ClO₄)₂(aq) + NaOH(aq)

e. Pb(C₂H₃O₂)₂(s) + HCl(aq)

f. NH₃(aq) + HIO₃(aq)

g. Ni²⁺(aq) + H₂O(l)

2. Determine if the following salts are acidic, basic, or neutral in aqueous solution. Write out all the pertinent chemical reactions that you need to consider to answer the question.

a. Na₂HPO₄

b. CrCl₂

c. LiF

3. A buffer is prepared to be 0.10 M NH₃ and 0.10 M NH₄Cl.

a. Find the pH of the buffer at 25 °C. Write all of the appropriate chemical reactions. No work = no credit.

b. 0.025 moles of HCl(g) is added to 1.0 L of the buffer. Write any new chemical reactions that occur and determine the new pH.

4. Consider the solubility of silver iodate.

a. Find the molar solubility in water. Write the appropriate chemical reactions. No work = no credit.

b. Find the molar solubility of silver iodate in a 0.010 M solution of sodium iodate.

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