Magnesium Sulfate Heptahydrate

MOLECULAR FORMULA :- MgSO4.7H20

MOLECULAR WEIGHT :- 246.50 g/mol

SPECIFICATION IP BP USP
Description Colorless crystals or white, Crystalline powder. White or almost  white, crystalline powder or brilliant , colorless crystals. Colorless crystals or white, Crystalline powder
Solubility Freely Soluble in water , very soluble in boiling water  and practically insoluble in ethanol

(96 % )

 
Identification

(A)    Reaction

(B)    Reaction

 

   A  : Reactions of Sulphates

B  : Reactions of Magnesium salts

  A: It gives reaction of Sulphates.

B :It gives reaction of  magnesium

A: It gives reaction of Sulphates.

B :  It gives reaction of  magnesium

pH of a 5% solution at 250C 5.0 – 9.2
Appearance of solution Dissolve 5 g in sufficient carbon dioxide free water to produced 50 ml (Solution A) is clear and colorless. Dissolve 5 g in sufficient carbon dioxide free water to produced 50 ml (Solution S) is clear and colorless.
Acidity or alkalinity

 

 NMT 0.2 ml of either 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the color of solution. NMT.0.2 ml of 0.01 M hydrochloric or 0.01 M sodium hydroxide is required to change the color of indicator.
Arsenic  

NMT 2 ppm.

 

NMT 2 ppm
Heavy metals  

NMT 10 ppm.

 

NMT 10 ppm
Selenium   NMT  30 ppm
Iron NMT 200 ppm. NMT 20 ppm  NMT 20 ppm
Chloride NMT. 300 ppm  

NMT. 300 ppm

 

  NMT. 140 ppm
Organic Volatile impurities   Meets the requirement
Residual Solvents   Meets the requirement
Loss on drying  

48.0 to 52.0 %

48.0 % – 52.0 % NMT  2.0 %
Loss on Ignition 40.0%-52.0%
Assay (on dried basis) 99.0 % to 100.5 % 99.0 % – 100.5 % 99.0%- 100.5%