Features Of A Titration Curve

Question 1

The equivalence point

Answer 1

At this point the acid has been neutralised fully by the base. The sharp vertical rise shows a rapid change in pH.

Question 2

When is the change in pH smallest

Answer 2

When using a weak acid and weak base together in a titration.

Bc they don’t ionise completely so not a big change in pH.

Question 3

The half neutralisation point

Answer 3

This is the point half way between zero and the equivalence point it can be used to calculate pKa of a weak acid by taking the pH at this point.

Question 4

At the half neutralisation point

Answer 4

[HA]=[A-]

so

Ka =[H+]

So -logKa = log[H+]

So pKa =pH