magnesium hydroxide n. (Chem.) A slightly alkaline chemical substance, Mg(OH)2, the active principle in the antacid milk of magnesia, also used as a laxative.
... excess of the magnesium solution tends both to throw out magnesium hydroxide (shown by a persistently flocculent precipitate) and to cause the phosphate to carry down molybdic acid. The tendency of the magnesium precipitate to carry down molybdic acid is also increased if the solution is too concentrated. The volume should not be less ... — An Introductory Course of Quantitative Chemical Analysis - With Explanatory Notes • Henry P. Talbot
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