Question 1
What is the change in pH after addition of 10.0 mL of 1.0 M aqueous sodium hydroxide to 90.0 mL of an aqueous 1.0 M NH
3/1.0 M NH
4+ buffer? (
Kb for ammonia is 1.8 × 10
-5)
◦ 1.0 pH unit
◦ 0.1 pH unit
◦ 0.01 pH unit
◦ 0.001 pH unit
◦ zero
Question 2
What is the concentration of the acetate ion of an aqueous solution measured to be 0.20 M acetic acid in 0.20 M hydrochloric acid? (
Ka for acetic acid = 1.8 × 10
-5)
◦ 3.6 × 10
-5 M
◦ 9.0 × 10
-6 M
◦ 1.8 × 10
-5 M
◦ 7.2 × 10
-5 M
◦ 0.20 M