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Sulphate of Soda

Also called Glauber's salt. This is usually obtained by dissolving 2 pounds of the chloride of sodium left after the distillation of muriatic acid (see No. 3883) in 1 quart of boiling water; the solution is next neutralized with carbonate of Mix the liquors, and, after defecation, decant and evaporate to 6 pints; let the impurities again settle, and neutralize the clear fluid, heated to boiling, with a solution of carbonate of soda in slight excess; crystals will be deposited as the solution cools, and by successively evaporating, adding a little soda to lime evaporated, and crystallized. It is sol- the mother liquor till it is feebly alkaline, and uble in cold water, its solubility decreasing cooling, more crystals may be obtained. as the temperature of the water is raised; Keep it in closed vessels. (Ed. Ph.) insoluble in alcohol, and fuses when heated. 4211. Hyposulphite of Soda. Mix