Sodium Hypophosphite

Grade

BP 63 (NaPH₂O₂)

NF-X (NaPH₂O₂.H₂O)

EN

Alkalinity

1.5 ml of 0.1 N HCl to neutralize

1.5 ml of 0.1 N HCl to neutralize

1.5 ml of 0.1 N HCl to neutralize

Identification

Should give characteristic reactions of calcium and hypophosphite

Should give characteristic reactions of Sodium and hypophosphite

Should give characteristic reactions of Sodium and hypophosphite

Arsenic

Max 4 ppm

Complies to Limit test

Max 5 ppm

Solubility

1part dissolves 1.0 part of water, 30 parts of alcohol and solution is Clear and colourless. Soluble in alcohol

1.0 gm dissolves slowly in 1.0 ml of water and solution is Clear and colourless. Soluble in alcohol

-

Phosphate

No opalescence within 1 min

No Precipitates or Turbidity within 1 min

-

Lead

Max. 10 ppm

-

-

Heavy Metals

-

Max. 20 ppm

Max. 10 ppm

Iron

-

-

Max. 10 ppm

Chloride

-

-

Max. 150 ppm

Sulphate

-

-

Max. 0.3 %

Phosphite

-

-

Max. 0.5 %

Loss On Drying

Not More than 2% for 2 hours

Not More than 3% for 2 hours

-

Calcium

-

Mixture remains clear for 1 min.

Max. 100 ppm

Assay

98.0 to 101.0 %

Not Less than 98%

98.0% to 101.0%