Sodium Metabisulfite

Na₂S₂O₅

IUPAC: Disodium disulfite

CAS: 7681-57-4

Overview

Sodium metabisulfite is a powerful reducing agent and preservative used in wine making, food preservation, and water treatment.

Composition

Element Symbol Atoms Atomic Mass
Oxygen O 5 15.9990
Sodium Na 2 22.9900
Sulfur S 2 32.0600

Elemental Composition

O
Oxygen ×5
42.1%
Na
Sodium ×2
24.2%
S
Sulfur ×2
33.7%

Uses

  • • Wine preservation
  • • Food antioxidant
  • • Water treatment
  • • Photography fixative

Fun Facts

  • ✦ Used by winemakers worldwide to prevent oxidation and bacterial spoilage

Safety

  • ⚠ Irritant
  • ⚠ Can trigger asthmatic reactions

Structure

SMILES

[O-]S(=O)S(=O)(=O)[O-].[Na+].[Na+]

Properties

Type
salt
State
solid
Molar Mass
190.11 g/mol
Density
1.4800 g/cm³
Melting Point
150.0 °C
Solubility
540 g/L at 20°C

Molecular Descriptors

Exact Mass
189.8983
TPSA
125.0 Ų
H-Bond Donors
0
H-Bond Acceptors
6
Rotatable Bonds
0
Heavy Atoms
9
Complexity
136.0

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 Sodium Metabisulfite?
Sodium Metabisulfite (Na₂S₂O₅) is a salt compound with the IUPAC name Disodium disulfite.
What is the molecular weight of Sodium Metabisulfite?
Sodium Metabisulfite has a molar mass of 190.11 g/mol.
What state is Sodium Metabisulfite at room temperature?
Sodium Metabisulfite is a solid at room temperature.
Is Sodium Metabisulfite organic or inorganic?
Sodium Metabisulfite is classified as an inorganic compound.
What elements make up Sodium Metabisulfite?
Sodium Metabisulfite (Na₂S₂O₅) is composed of Oxygen (O), Sodium (Na), Sulfur (S).