Assignment

1. A basic solution can be defined as one in which:

   1. [H₃O⁺] is not present
   2. [H₃O⁺] equals [OH⁻]

2. Which one is a self-indicator?

   1. K₂Cr₂O₇
   2. Cr₂(SO₄)₂
   3. KMnO₄
   4. H₂C₂O₄·2H₂O

3. Which of the following combinations can't produce a buffer solution?

   1. HNO₂ & NaNO₂
   2. HCN & NaCN
   3. HClO₄ & NaClO₄
   4. NH₃ & (NH₄)₂SO₄
   5. NH₃ & NH₄Br

4. What is the pH of a solution composed of 0.20 M NH₃ & 0.15 M NH₄Cl?

   1. 2.15
   2. 4.65
   3. 8.26
   4. 9.38
   5. 8.89

5. Calculate the ratio [CH₃COOH]/[CH₃COONa] that gives a solution with pH = 5.00.

   1. 0.28
   2. 0.36
   3. 0.44
   4. 0.56
   5. 0.63