Overview

Potassium bisulfate (poe-TAS-ee-yum BYE-sul-fate) is an odorless white crystalline solid that begins to decompose at its melting point. It is deliquescent, meaning that has such a strong tendency to absorb moisture from the air that it becomes wet and dissolves in the water it has absorbed.

How It Is Made

Potassium bisulfate is typically made by heating potassium sulfate (K₂SO₄) with sulfuric acid. The acid provides the hydrogen needed to convert the salt (K₂SO₄) to the corresponding acid salt (KHSO₄).

Key Facts

Other Names:

Potassium hydrogen sulfate; potassium acid sulfate

Formula:

KHSO₄

Elements:

Potassium, hydrogen, sulfur, oxygen

Compound Type:

Acid salt (inorganic)

State:

Solid

Molecular Weight:

136.17 g/mol

Melting Point:

about 200°C (about 400°F); decomposes

Boiling Point:

Not applicable

Solubility:

Soluble in water; decomposes in alcohol Potassium Bisulfate

Common Uses and Potential Hazards

Potassium bisulfate is used as a food additive. The compound...