Dibasic Potassium Phoshphate

PRODUCT NAME

: DIBASIC POTASSIUM PHOSPHATE

C.A.S. No.

: 7758-11-4

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

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Identification

• (A) ) Reaction
• (B) Reaction
• (C) Reaction

• Solution S (see Tests) is slightly alkaline
• Solution S gives reaction of phosphate
• Solution S gives reaction of potassium

• Solution S gives reaction of phosphate
• Solution S gives reaction of potassium

Reducing substances

The solution remains faintly pink.

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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 125-130ËšC)

NMT 2.0 %

NMT 1.0 %

Assay (dried substance).

98.0 % to 101.0 %

98.0 % to 100.5 %