Hi Rohan,
Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials, and often have a characteristic pleasant, fruity odor. This leads to their extensive use in the fragrance and flavor industry. Ester bonds are also found in many polymers.

Esterification is a reversible reaction. Hydrolysis—literally "water splitting"—involves adding water and a catalyst (commonly NaOH) to an ester to get the sodium salt of the carboxylic acid and alcohol. As a result of this reversibility, many esterification reactions are equilibrium reactions and therefore need to be driven to completion according to Le Chatelier's principle. Esterifications are among the simplest and most often performed organic transformations.

The most common esterification processes involve nucleophilic acyl substitution where the carbonyl compound is used as an electrophile and is attacked by a nucleophilic alcohol. However, other processes are possible; esterification by alkylation reverses the roles of "classic" carbonyl chemistry: a carboxylate anion is used as a nucleophile that displaces a halide ion in an SN2 reaction.
										

										
Dear Rohan,
You mailed us the question through mail i.e.  :   What happens if tertiery amines reacts with hydrochloric acid?
Check out the Answer here :

(CH3CH2)3N + HCL   (CH3CH2)3NH+ + Cl- OR is it written: ((CH3CH2)3NH+)(Cl-)
 

Actually secondary and tertiary amines form ammonium salts on reactions with acids like HCL as well as nitric acid and sulphuric acid
so the final product will be an ammonium salt.
 
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Vijay luxmi