Molar Mass of Acetic Acid| Easy-Explanation

Atomic mass (CH₃COOH)

(Atomic masses : C=12u; H=1u; O=16u) 
Carbon atoms = 2;
Hydrogen atoms = 4;
Oxygen atoms = 2.

CH₃COOH=1×C+3×H+1×C+2×O+1×H
=12+3+12+32+1 = 60u

Lewis Structure of CH₃COOH (Ethanoic Acid)

From the structure, We can notice that CH₃COOH has 8 bonds (or 16 shared electrons) and 4 lone pairs (8 unshared electrons). In order to draw the lewis structure of acetic acid, we need to follow the following steps:

Step-1 (Determine the number of valence electrons in individual atoms)
Carbon has 4, oxygen has 6, and hydrogen has 1 valence electron.
Step-2 (Determine the number of valence electrons in CH₃COOH )
Two carbon atoms times 4 electrons, plus two oxygen atoms times 6 electrons, plus four hydrogen atoms times 1 valence electron equals 24 valence electrons.
valence electrons in CH₃COOH = 2(4)+2(6)+4(1)=24.
Step-3 (Place electron pairs between the atoms)
Draw lines between atoms. One electron pair between two atoms is equivalent to one line.
Step 4 (Place remaining electrons)
There are 8 bonds (16 shared electrons) and 4 lone pairs (8 unshared electrons).

• The molar mass of acetic acid is 60.052 g/mol.
  Ethanoic acid (another name)
• colorless liquid
• Unpleasant order.
• Soluble in water.
• 5-8% solution is called Vinegar.
• Also called Glacial acid.
• The melting point is 16.6 °C.
• The boiling point is 118 °C.
• The density is 1.05 g/cm³.
• pH of CH₃COOH = 2.4 (1M solution).

What is Acetic acid?

Acetic acid is also called ethanoic acid.
It is the most important of the carboxylic acids and consists of a methyl group attached to a carboxyl group.
It is made by methanol carbonylation, where methanol and carbon monoxide react to produce acetic acid.
CH3COOH is miscible with ethanol, ethyl ether, acetone, and benzene.
It is also soluble in carbon tetrachloride and carbon disulfide.
A dilute (5% by volume sol) CH₃COOH is called vinegar.

Acetic acid Uses

• 5-8 % CH₃COOH solution is called vinegar and is widely used as a preservative in pickles.
• used in the manufacture of esters.
• It is sprayed on livestock silage to eliminate fungal and bacterial growth.
• CH3COOH is used in the preparation of metal acetates, which are used in some printing processes.
• Cellulose acetate is used in making photographic films and textiles.
• It is used as a solvent for resins, paints, and lacquers.