CAS NO: 10034-99-8
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% |
Magnesium Sulfate Heptahydrate is employed in explosives, matches, mineral water, and tanning leather. Employed in weighing cotton and silk, increasing the bleaching action of chlorinated lime, manufacture of mother-of-pearl and frosted papers and fire-proofing fabrics. Magnesium Sulfate Heptahydrate has been used in a simple medium that preserves low concentrations of E. coli for use in the water bacteriology proficiency test.
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