Question

Why water is removed as soon as the formation of ester?

Answer 1

Esters are formed when Carboxylic acid is heated with alcohol in presence of concentrated Sulphuric acid (in some cases dry hydrogen chlorine gas is used to get aromatic esters)

So So formation of ester is slow but reversible reaction it forms ester & water molecules if we won't remove water as soon we get ester then it will get reactants again which we used to form esters

That's why water should been removed