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Oxalate of Nickel

This is a pale bluish-green precipitate formed by adding a strong solution of oxalic acid to a like solt.tion of sulphate of nickel. boiling point, and add 12 troy ounces sulphate ammonia, yielding a greenish-blue liqui... 4179. Tests for Solutions of the Salts of Nickel. Caustic alkalies give a pale-green precipitate, insoluble in excess of the precip:tant, but soluble in a solution of carbonate (f Ferrocyanide of potassium gives a greenishoccasions no change in solutions of nickel containing free mineral acid; but with alkaline solutions gives a black precipitate. of iron in coarse powder, 3 ounces at a time, stirring after each addition till effervescence white precipitate. Sulphuretted hydrogen ceases. Continue the heat until the solution acquires a reddish-brown color, and is free from nitrous odor. When nearly cold add water to make it up to 14 pints. (U. S. Ph.)