Question 1
A 25.0 mL sample of 0.150 mol L
-1 hydrofluoric acid is titrated with a 0.150 mol L
-1 NaOH solution. What is the pH before any base is added? Hydrofluoric acid is monoprotic. The
Ka of hydrofluoric acid is 3.5 × 10
-4.
◦ 2.15
◦ 7.07 × 10
-3◦ 2.33 × 10
-3◦ 2.63
◦ 3.46
Question 2
A 25.0 mL sample of 0.150 mol L
-1 acetic acid is titrated with a 0.150 mol L
-1 NaOH solution. What is the pH after 26.0 mL of base is added? The
Ka of acetic acid is 1.8 × 10
-5.
◦ 7.00
◦ 11.47
◦ 4.74
◦ 2.54
◦ 10.18