Chemistry Forum

Carbonic acid is a chemical compound with the chemical formula as H₂CO₃ and molecular formula as CH₂O₃. It is an inorganic weak acid, which exists only as a solution. Carbonic acid is also known as acid of air, aerial acid or dihydrogen carbonate. It forms two kinds of salts: carbonates and bicarbonates. Ph of carbonic acid is 4.68 in 1mM.

Carbonic acid is specifically diprotic acid, which means that it has two protons which can disassociate from the parent molecule. Thus, have two disassociation constants, first for bicarbonate ion disassociation and second for disassociation of the bicarbonate ion into the carbonate ion.

Occurrence:

Carbonic acid is present in blood in the human body. It is formed in human body when water gets dissolved with carbon dioxide. It is also present in rain water, calcite, fermentation, coal, ground water, meteors, volcanoes, amino acids, proteins, oceans, plants, erythrocytes, sulphur deposits, salts, and caves.

Properties of carbonic acid:

Physical:

Appearance: Grayish white solid.

Melting point: 210 Celsius, boiling point: -78 degree Celsius.

Molecular weight: 62.024 g/mol.

Solubility: Insoluble.

Carbonic acid has a pH value of less than 7.

Carbonic acid is odorless and has alkaline taste.

Chemical:

Carbonic acid is weak and unstable dibasic acid.

It has acidity of 6.3 pK.

Preparation of Carbonic acid:

Reagents

Calcium carbonate

Hydrochloric acid solution

Litmus

Water

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