Answer to Question #180715 in Organic Chemistry for Mohlolo

Question

Suppose we titrate 20mL of 0.100M HCHO₂ with 0.100M NaOH. Calculate the pH

1. Before any base is added

2. When half of the HCHO₂ has been neutralized

3. After a total of 15.0mL of base has been added.

Formic acid constant k_a =1.8 ×10^-4

Answer 1

1.pH = 2.37

At this stage no buffer solution has been prepared.

2.pH = 3.74

3.pH = 4.22