Molecular formula KNaC4H4O6·4H2O
Structural formula KOOC(CHOH)2COONa·4H2O
M.W. 282.23
Description Colorless transparent crystals or white crystalline powder with salt and cool taste and has light efflorescence in hot air. Losting 3 molecule water at 100 and becoming anhydrous salt at 215, soluble in water, practically insoluble in ethanol and its aqueous solution appears alkalescence to litmus, PH value 7 to 8, relative density (d204) 1.790, melting point 70 to 80.


Item Index

Content %

99.0 ~ 102.0

Alkalinity Qualified
Arsenic (As)≤% 0.0003
Heavy metals (on Pb)≤% 0.0010
Moisture≤% 21-26

CNS K7405

Item Index

Content %

99.0 ~ 101.0

Insoluble matter 0.005
Free acid (KHC4H4O6) 0.12
Chloride (Cl) 0.001
Phosphate (PO4)


Sulphate (SO4) 0.005
Ammonia (NH3) 0.003
Calcium (Ca) 0.005
Heavy metals (on Pb) 0.0005
Iron (Fe) 0.001

Used as masking agent and complexing agent in analysis, for formulating Fehling's solution and determining uric acid and seroglycoid, its monocrystals can be used as piezoelectric cell.

Packaging In 25Kg P/E bags covered with woven bags.
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