Explain the esterification process, including the role of concentrated sulphuric acid and how to obtain a higher yield of ester.

Esterification is the formation of an ester through the reaction of an alcohol and a carboxylic acid. This reaction is typically slow and reversible. Concentrated sulfuric acid is often used as a catalyst; it helps remove the water produced during the reaction, which prevents the reverse reaction (hydrolysis) and shifts the equilibrium towards a higher yield of the ester.

The mechanism involves the elimination of the hydroxyl ($\text{OH}$) group from the carboxylic acid and a hydrogen ($\text{H}$) atom from the hydroxyl ($\text{OH}$) group of the alcohol, combining to form a water molecule.

The general reaction can be represented as:

$$\text{Alcohol} + \text{Acid} \xrightleftharpoons[\text{heat}]{\text{conc. } \text{H}_2\text{SO}_4} \text{Ester} + \text{Water}$$