Dibasic Potassium Phosphate

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CAS NO:7758-11-4

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 %

Description

Potassium Phosphate, Dibasic, Anhydrous (K2HPO4) is a reagent with a very high buffering capacity. Potassium Phosphate, Dibasic, Anhydrous is widely used in molecular biology, biochemistry, and chromatography. Potassium phosphate occurs in several forms: monobasic (KH2PO4), dibasic (K2HPO4), and tribasic (K3PO4). Neutral potassium phosphate buffer solutions may be prepared with a mixture of the monobasic and dibasic forms to varying degrees, depending on the desired pH. Potassium Phosphate buffers are very useful in numerous applications, but with the following limitations: precipitation of Ca2+ and Mg2+, inhibition of restriction enzyme activity, and interference in DNA ligation or bacterial transformation protocols. Potassium Phosphate, Dibasic, Anhydrous has been used to study the effects of freezing and thawing on the stability of proteins sensitive to conformational changes; it was found that Potassium Phosphate, Dibasic, Anhydrous buffers offered improved pH stability as opposed to NaP buffers. Potassium Phosphate, Dibasic, Anhydrous has also been used for the extraction of keratohyalin protein from bovine tissue. Potassium Phosphate, Dibasic, Anhydrous is also known as Dipotassium hydrogenphosphate, Dipotassium phosphate, and sec.-Potassium phosphate. Additional forms available: Potassium Phosphate, Dibasic, Anhydrous Potassium Phosphate, Monobasic Potassium phosphate tribasic Potassium phosphate tribasic monohydrate Potassium phosphate dibasic solution Potassium Phosphate Monobasic solution

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