Page 73 - Analytical Chemistry I E-book

Problems & questions

• Calculate the pH after addition of 0.00, 5.00, 15.00, 25.00, 40.00, 45.00, 49.00,
50.00, 51.00, 55.00, and 60.00 mL of 0.10 M NaOH in the titration of 50.00 mL
of 0.10 M HNO3.

• Calculate pH of the following reaction mixtures:
- 10.00 mL of 0.10 M NaOH with 25.00 mL of 0.10 M HCl.
- 40.00 mL of 0.10 M NaOH with 25.00 mL of 0.10 M HCl.
- 20.00 mL of 0.1750 M HCl with 25.00 mL of 0.132 M NaOH.
- 10.00 mL of 0.10 M NaOH with 25.00 mL of 0.10 M CH3COOH (Ka = 1.7 x 10–5).

• Calculate the pH of the solution that results when 20.0 mL of 0.1750 M formic
acid (Ka = 1.4 x 10–4) is:
(a) diluted to 45.0 mL with distilled water.
(b) mixed with 25.0 mL of 0.140 M NaOH solution.
(c) mixed with 25.0 mL of 0.200 M NaOH solution.
(d) mixed with 25.0 mL of 0.200 sodium formate solution.