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LABORATORY CHEMICALS

Sodium Metabisulfite

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Specifications

Quantity100gram
Purity99.9%
Chemical FormulaNa₂S₂O₅
Molar Mass190.11 g/mol
CAS Number7681-57-4
AppearanceWhite to slightly yellow crystalline powder
OdorSulfurous (SO₂-like)
Density1.48 g/cm³
Melting Point>300 °C (decomposes)
Solubility in Water540 g/L at 20 °C (very soluble)
pH (50 g/L solution)3.5–5.0
Refractive Index1.474
HygroscopicYes, sensitive to air and moisture

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