Question

A base is added to an acid during a titration. A pH meter is used to monitor the reaction’s progress. When should the addition of base stop? when adding a few drops of base causes a large decrease in pH when adding a few drops of base causes a large increase in pH when adding a few milliliters of base causes a large increase in pH when adding a few milliliters of base causes a large decrease in pH

Answer 1

when adding a few drops of base causes a large increase in pH

Answer 2

Answer: The correct answer is'when adding a few drops of base causes a large increase in pH'.

Explanation:

When an acid reacts with base neutralization reaction occurs which means that  H^+ ions from the acid and OH^- ion from the base combine together to form neutral molecule of water.

• If the concentration of $H^+$ is slightly higher than the $OH^-$ concentration then the pH of the solution will become lower than 7.

• If the concentration of $OH^-$ is slightly higher than the $H^+$ concentration then the pH of the solution will become higher than 7.
• If concentration of both $H^+$ and $OH^-$are equal then the pH of the solution will be 7. That is neutral pH.

During the titration , while adding base to an acid. Addition of base must be stopped when large increase in value of pH of an acid is observed on a pH meter.