Question

1. What is the pH of a buffer thatis composed of 100. mL of 0.20 M NH₄Cl and 200. mL of 0.10 MNH₃?

2. If anacetic acid/sodium acetate buffer solution is prepared from 100.0mL of 0.100 M acetic acid, what volume of 0.100 M sodium acetatemust be added to yield a final pH of 4.00?

3. How manymL of 12.0 M HCl must be added to 500.0 ml of 0.50 M sodium acetateto prepare a buffer of pH 4.75?

4.How many grams of ammonium chloride must bedissolved in 1.00 L of 0.200 M ammonia to make a buffer of pH8.50?

5. Which of the following would be an ideal buffersolution?

0.20 M HCN / 0.10 MKCN 0.20 M HCl / 0.10 M KOH

0.20 M CH₃CO₂H / 0.10 M HCO₂H 0.10 HCl / 0.010 M KCl

Describe how toprepare 500.0 ml of this buffer with maximum bufferingcapacity.