# Where does the water come from when methyl propanoate forms? What is the formula of the ester?

Jul 25, 2014

The water comes from the OH of the acid and the H of the alcohol. The formula of the ester is CH₃CH₂C(=O)-OCH₃.

#### Explanation:

Propanoic acid reacts with methanol in the presence of concentrated sulfuric acid to form methyl propanoate. Concentrated sulfuric acid catalyzes the reaction.

$\underbrace{\text{CH"_3"CH"_2"C(=O)-"color(red)("OH"))_color(red)("propanoic acid") + underbrace(color(red)("H")"-OCH"_3)_color(red)("methanol") stackrelcolor(blue)("conc. H"_2"SO"_4)(→) underbrace("CH"_3"CH"_2"C(=O)-OCH"_3)_color(red)("methyl propanoate") + underbrace(color(red)("H"_2"O"))_color(red)("water}}$