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Magnesium sulfate or magnesium sulphate is a chemical compound, a salt with the formula MgSO 4, consisting of magnesium cations Mg 2+ (20.19% by mass) and sulfate anions SO 2− 4. It is a white crystalline solid , soluble in water but not in ethanol .
Magnesium sulfate is effective in decreasing the risk that pre-eclampsia progresses to eclampsia. [24] Intravenous magnesium sulfate is used to prevent and treat seizures of eclampsia. It reduces the systolic blood pressure but does not alter the diastolic blood pressure, so the blood perfusion to the fetus is not compromised.
Like magnesium oxide, it will generate a basic carbonate when placed in the air. [3] Magnesium sulfide can be produced by the reaction of magnesium and hydrogen sulfide, or by the reaction of magnesium sulfate and carbon disulfide at high temperature: [6] Mg + H 2 S → MgS + H 2 3 MgSO 4 + 4 CS 2 → 3 MgS + 4 COS + 4 SO 2
Because magnesium is a mobile nutrient, magnesium chloride can be effectively used as a substitute for magnesium sulfate (Epsom salt) to help correct magnesium deficiency in plants via foliar feeding. The recommended dose of magnesium chloride is smaller than the recommended dose of magnesium sulfate (20 g/L). [20]
Unlike natural magnesium silicates like talc, forsterite, and olivine which are crystalline, synthetic magnesium silicates are amorphous. [1] Synthetic magnesium silicates are insoluble in water or alcohol. [4] The particles are usually porous, and the BET surface area can range from less than 100 m 2 /g to several hundred m 2 /g.
For anhydrous magnesium sulphate it seems simple. Start with 100 ml water and add the salt until the solution is saturated. Well for the first percent of salt the volume of the solution is no longer 100 ml. It is less, it shrinks but finally the solution is saturated when 35 g has been added (corresponding to about 25.5 % at 20 °C).