Formaldehyde Sodium Bisulfite
Structural Formula Vector Image
Title: Formaldehyde Sodium Bisulfite
CAS Registry Number: 870-72-4
CAS Name: Hydroxymethanesulfonic acid monosodium salt
Additional Names: sodium formaldehydebisulfite; methylolsulfonic acid sodium salt
Molecular Formula: CH3NaO4S
Molecular Weight: 134.09
Percent Composition: C 8.96%, H 2.26%, Na 17.15%, O 47.73%, S 23.91%
Line Formula: HOCH2SO3Na
Literature References: Prepn: Skrabal, Skrabal, Monatsh. Chem. 69, 17 (1936); Chhabria et al., DE 1173059 (1964 to Schill & Seilacher). Structure: Lauer, Langkammerer, J. Am. Chem. Soc. 57, 2360 (1935); Caughlan, Tartar, ibid. 63, 1266 (1941).
Derivative Type: Monohydrate
Properties: Needles from water. pK (25°): 6.92.
pKa: pK (25°): 6.92
Use: Fixing agent for keratin-containing fibers. Flotation of lead-zinc ores. Protecting color pictures exposed to high humidities against fading and staining.

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