Mg.=24.3.

1. Magnesii Sulphas.Magnesium Sulphate

Magnesii Sulphas.Magnesium Sulphate. MgSo4+H2O =245.84. Synonym. - Epsom Salt

Source

It is obtained from (1) Dolomite (native Calcium and Magnesium Carbonate); or (2) Magnesite (native Magnesium Carbonate), by the action of Sulphuric Acid. (1) MgCo3+MgSo4+2H2So4=CaSo4+MgSo4 +2H2O or (2) MgCo3+ H2So4=MgSo4+H2O+Co2 Treat with water, filter and evaporate the filtrate to crystallization.

Characters

Small, colorless, rhombic prisms or acicular crystals, very like Zinc Sulphate, but moister, and of a bitter taste, whilst that of the Zinc Salt is metallic. Solubility. - In 1.5 parts of cold water.

Incompatibles

Alkaline carbonates, phosphoric acid, phosphates, lime water, lead acetate and silver nitrate.

Impurities

Lime and Iron.

Magnesium Sulphate is contained in Infusum Sennae Compositum.

Dose, 1/4 to 1 oz.; 8. to 30. gm.

2. Magnesii Carbonas.Magnesium Carbonate

Magnesii Carbonas.Magnesium Carbonate. (MgCo3)4, Mg(OH)2+5 H2O=484.62.

Source

Mix strong, boiling aqueous solutions of Magnesium Sulphate and Sodium Carbonate, and evaporate. 4MgSo4+4Na2Co3+H2O=(Mg Co3)4, Mg(OH)2+4Na2So4+Co2. Digest with water, filter and dry.

Characters

Light, white friable masses, or a light white powder, without odor, and having a slightly earthy taste. Solubility. - Almost insoluble in water.

Impurities

Lime and sulphates.

Magnesium Carbonate is used to prepare Magnesia.

Dose, 1/4 to 2 dr.; 1. to 8. gm.

Preparations

1. Magnesii Citras Effervescens. Effervescent Magnesium Citrate

Magnesii Citras Effervescens. Effervescent Magnesium Citrate. Magnesium Carbonate, 10; Citric Acid, 46; Sodium Bicarbonate, 34; Sugar, 8; Alcohol and distilled water, a sufficient quantity.

Characters

A white, coarsely granular salt, without odor, and having a mildly acidulous, refreshing taste, deliquescent. Solubility. - With copious effervescence, in 2 parts of water; almost insoluble in Alcohol.

Dose, 1/4 to 1 oz.; 8. to 30. gm.

2. Liquor Magnesii Citratis. Solution Of Magnesium Citrate

Liquor Magnesii Citratis. Solution Of Magnesium Citrate. Dissolve Magnesium Carbonate, 15; in a solution of Citric Acid, 30; add Syrup of Citric Acid, 60; then crystals of Potassium Bicarbonate, 25. Cork and wire immediately. It effervesces when uncorked.

Dose, 2 to 8 fl. 02.; 60. to 240. c.c.

3. Magnesia. Light Magnesia

Magnesia. Light Magnesia. MgO =40.26. Synonym. - Calcined Magnesia.

Source

By heating the official Magnesium Carbonate; water and Carbon Dioxide are given off, and Magnesium Oxide remains behind. 4(MgCo3), Mg(OH)2+5H2O=5MgO+4Co2+6H2O.

Characters

A white, very light and very fine powder, without odor, and having an earthy, but not saline taste. Solubility. - Almost insoluble in water; insoluble in Alcohol.

Light Magnesia is used to prepare Heavy Magnesia and is contained in Massa Capaibae, Pulvis Rhei Compositus and Ferri Oxidum Hydratum cum Magnesia.

Dose, 5 to 60 gr.; .30 to 4.00 gm.

4. Magnesia Ponderosa. Heavy Magnesia

Magnesia Ponderosa. Heavy Magnesia. MgO=40.26. Source. - From Magnesia by trituration for some time in the presence of strong Alcohol, drying, and rubbing to powder.

Characters

A white, dense and very fine powder, which should correspond to the tests for Magnesia, from which it differs in not readily uniting with water to form a gelatinous hydrate.

Dose, 5 to 60 gr.; .30 to 4.00 gm.