Description
Technical Bulletin
Label
Molecular Formula ……………………………………………………………………….. Na2S2O5
Molecular Weight …………………………………………………………………………. 190.10
White or Yellowish crystalline powder
LABEL PROPERTY
Physical state and appearance …………………………………………………………………… Solid. (Crystals solid or Powdered solid.)
Odor …………………………………………………………………………………………………….. odor of sulfur dioxide
Taste ……………………………………………………………………………………………………. Not available.
Molecular Weight ……………………………………………………………………………………. 190.13 g/mole
Color ……………………………………………………………………………………………………. White to yellowish.
pH ……………………………………………………………………………………………………….. (1% soln/water): 4.3 [Acidic.]
Boiling Point …………………………………………………………………………………………… Not available.
Melting Point ……………………………………………………………………………………………. Decomposition temperature: 150°C (302°F)
Critical Temperature …………………………………………………………………………………… Not available.
Specific Gravity …………………………………………………………………………………………. 1.4 (Water = 1)
Vapor Pressure …………………………………………………………………………………………. 1.4 (Water = 1)
Vapor Density ……………………………………………………………………………………………. Not available.
Volatility …………………………………………………………………………………………………… Not available.
Odor Threshold ………………………………………………………………………………………….. Not available.
Water/Oil Dist. Coeff …………………………………………………………………………………… Not available.
Ionicity (in Water) ………………………………………………………………………………………. Not available.
Dispersion Properties ………………………………………………………………………………….. See solubility in water.
Solubility ……………………………………………………………………………………………………. Easily soluble in cold water, hot water. Freely soluble in glycerol. Slightly soluble in alcohol. Moderately soluble in ethanol.
