|
Appearance
|
White powder or colorless crystals
|
|
Assay (on anhydrous basis)
|
98.0 -103.0% (as NaH2PO4)
|
|
Identification 'A' & 'B'
|
Passes IP test
|
|
pH (5% solution in water)
|
4.1 - 4.5
|
|
Insoluble substances
|
Max 0.2%
|
|
Chloride (Cl)
|
Max 0.014%
|
|
Aluminium, calcium and related elements
|
Passes test
|
|
Arsenic (As)
|
Max 0.0008%
|
|
Water
|
18.0 - 26.5%
|
|
Solubility
|
Very soluble in water;very slightly soluble in ethanol
|