# What is a discriminating test for the presence of a carboxylic acid?

May 23, 2016

#### Answer:

The classic test is the evolution of gas from when sodium bicarbonate is added.

#### Explanation:

Take an aqueous solution of the acid, treat this $N a H C {O}_{3}$, and the solution will effervesce.

HCO_3^(-) + HO(O=)CR rarr CO_2(g)uarr + H_2O + ""^(-)O(O=)CR

As with all chemical tests, you should do it first on an authentic carboxylic acid so that you know what constitutes a positive.