After the hydrolysis of ester the change in the concentration of acid at different intervals is calculated by _:

Explanation

The change in the concentration of acid at different intervals after the hydrolysis of ester is calculated by titration with standard alkali. In the hydrolysis of ester, the ester is broken down into an alcohol and a carboxylic acid. The carboxylic acid can be titrated with a standard alkali, such as sodium hydroxide (NaOH). The amount of alkali required to neutralize the acid is a measure of the concentration of the acid. The titration is carried out by adding the standard alkali to the acid solution until the acid is neutralized. The endpoint of the titration is indicated by a change in the pH of the solution.