Sodium Phosphate Monobasic Dihydrate

MOLECULAR FORMULA :- NaH2PO4.2H20

MOLECULAR WEIGHT :- 156.01 g/mol

SPECIFICATION IP BP USP
Description A white powder or colorless crystals. White, slightly deliquescent crystals or granules. White, slightly deliquescent crystals or granules.
Solubility Very soluble in water and very slightly soluble in ethanol (96 %).
Identification

(A)   Reaction

(B)   Reaction

 

 

 

A: It gives reaction of phosphates.

B: It gives reaction of sodium salts.

 

 

A : 10 % solution is slightly acidic

B: It gives reaction of Phosphates.

C: It gives reaction of Sodium Salts.

 

 

A : Gives reaction of  phosphates

B: Gives reaction of sodium salts.

 

 

Appearance of solution Solution is clear & Colorless
pH 4.1 – 4.5 4.2  –  4.5 4.1  –  4.5
Insoluble Sub. NMT 0.2 % NMT.0.2 %
Chloride NMT 140 ppm NMT 200 ppm NMT  140 ppm
Sulphate NMT 1500 ppm NMT 300  ppm NMT 1500 ppm
Al , Ca & related –element Not became turbid when rendered slightly alkaline to litmus paper. Not became turbid when rendered slightly alkaline to litmus  paper
Arsenic NMT 8 ppm NMT 2 ppm NMT 8 ppm
Heavy metals NMT 20 ppm NMT 20 ppm
Water by KF 18.0 % -26.5 % 18.0 % -26.5 %
Organic volatile impurities Meets the requirement
Residual Solvents   Meets the requirement
Iron NMT 10 ppm
Reducing substance The color of the permanganate is not completely discharged.
LOD ( at 1300C ) 21.5 %-24.0 %
Assay (on dry basis) 98.0 % – 103.0 % 98.0 % – 100.5% 98.0%-103.0%