Dibasic Potassium Phosphate

MOLECULAR FORMULA :- K2HPO4

MOLECULAR WEIGHT :- 174.18

SPECIFICATION BP USP
Description White or almost white powder or colorless crystals, very hygroscopic. White or almost white powder or colorless crystals, very hygroscopic.
Solubility Very soluble in water, very slightly soluble in ethanol (96 per cent).
Appearance of solution Solution is clear & Colorless
Identification

(A) ) Reaction

(B) Reaction

(C) Reaction

 

A.   Solution S (see Tests) is slightly alkaline

B.   Solution S gives reaction of phosphate

C.   Solution S gives reaction of potassium

A.   Solution S gives reaction  of phosphate

B.   Solution S gives reaction of potassium

 

Reducing substances The solution remains faintly pink.
Heavy Metals NMT 0.001 %
Limit of Fluoride NMT 0.001 %
pH 8.5-9.6
Monopotassium phosphate This ratio is not greater than 0.025.
Chlorides NMT200 ppm
Sulphates NMT 0.1 %
Arsenic NMT 2 ppm
Sodium NMT 0.1 % A solution tested on a platinum wire imparts no pronounced yellow color to a nonluminous flame.
Limit of Monobasic OR tribasic salt NMT 0.001 %
Iron NMT10 ppm NMT 30 ppm
Residual solvents Meets the requirement
Loss on Drying(at 125-130˚C) NMT 2.0 % NMT 1.0 %
Assay (dried substance). 98.0 % to 101.0 % 98.0 % to 100.5 %