Potassium Aluminum Sulfate

KAl(SO₄)₂

IUPAC: Potassium aluminium sulfate

CAS: 7784-24-9

Overview

Potash alum is a double salt used in water purification, pickling, and as an astringent. It has been used since antiquity.

Composition

Element	Symbol	Atoms	Atomic Mass
Oxygen	O	8	15.9990
Aluminum	Al	1	26.9820
Sulfur	S	2	32.0600
Potassium	K	1	39.0980

Elemental Composition

Oxygen ×8

49.6%

Aluminum ×1

10.4%

Sulfur ×2

24.8%

Potassium ×1

15.1%

Uses

• Water purification
• Pickling agent
• Aftershave astringent
• Baking powder

Fun Facts

✦ Ancient Romans used alum to purify drinking water over 2,000 years ago

Structure

SMILES

O.O.O.O.O.O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Al+3].[K+]

Properties

Type: salt
State: solid
Molar Mass: 258.21 g/mol
Density: 1.7250 g/cm³
Melting Point: 92.0 °C
Solubility: 140 g/L at 20°C

Molecular Descriptors

Exact Mass: 473.9755
TPSA: 189.0 Å²
H-Bond Donors: 12
H-Bond Acceptors: 20
Rotatable Bonds: 0
Heavy Atoms: 24
Complexity: 62.0

Related Compounds

Ammonium Bicarbonate

NH₄HCO₃

Ammonium Chloride

NH₄Cl

Ammonium Sulfate

(NH₄)₂SO₄

Barium Carbonate

BaCO₃

Barium Chloride

BaCl₂

Barium Sulfate

BaSO₄

Cadmium Sulfide

CdS

Calcium Acetate

Ca(C₂H₃O₂)₂

Calcium Carbonate

CaCO₃

Calcium Citrate

Ca₃(C₆H₅O₇)₂

Frequently Asked Questions

What is Potassium Aluminum Sulfate?

Potassium Aluminum Sulfate (KAl(SO₄)₂) is a salt compound with the IUPAC name Potassium aluminium sulfate.

What is the molecular weight of Potassium Aluminum Sulfate?

Potassium Aluminum Sulfate has a molar mass of 258.21 g/mol.

What state is Potassium Aluminum Sulfate at room temperature?

Potassium Aluminum Sulfate is a solid at room temperature.

Is Potassium Aluminum Sulfate organic or inorganic?

Potassium Aluminum Sulfate is classified as an inorganic compound.

What elements make up Potassium Aluminum Sulfate?

Potassium Aluminum Sulfate (KAl(SO₄)₂) is composed of Oxygen (O), Aluminum (Al), Sulfur (S), Potassium (K).