Colloidal Tungstic Acid-I

When dilute hydrochloric acid is added to a solution of sodium tungstate until the liquid becomes slightly acid, a colloidal solution of tungstic acid is obtained. If the solution of sodium tungstate is concentrated, a white gelatinous precipitate is obtained on the addition of the acid. This precipitate, after washing by decantation at a low temperature (0° to 5° C.) with as little exposure to air as possible, may be dissolved in a concentrated solution of oxalic acid and the liquid subjected to dialysis. If the outer water is repeatedly changed, the oxalic acid may be completely removed, leaving a colloidal solution of tungstic acid.


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