RP9- pH changes

Question 1

Why does a pH meter have to be calibrated?

Answer 1

so that the values for each reading are accurate

Question 2

How can you investigate how a weak acid’s pH changes as a strong base is added?

Answer 2

• eg CH3COOH and NaOH
• add small amounts of NaOH each time

Question 3

Why is stirring the solution important?

Answer 3

so all acid and base is thoroughly mixed, so pH doesn’t vary