Sodium metabisulfite

 

Sodium metabisulfite

Chemical formula	Na2S2O5
OTP appearance	white to yellow powder
Molar Mass(g/mol)	190.107
Density(g/cc)	1.48
Melting Point(°C)	150(decomp)
Solubility in water(g/L)	653
NFPA 704	0 2 1

Uses

Other

• Medical excipient preventing oxidation of epinephrine
• Simple source of sulfur dioxide
• Sanitizer

Natural occurrence

• Does not occur naturally

Production

Synthesis

• Sodium metabisulfite can be prepared by evaporating a solution of sodium bisulfite saturated with sulfur dioxide which leaves solid sodium metabisulfite behind.

  2 NaHSO₃ + SO₂ → Na₂S₂O₅ + H₂O

See Also

• US patent 5753200
  Link courtesy Google