A Compendious Manual of Qualitative Chemical Analysis
A Compendious Manual of Qualitative Chemical Analysis
Charles William Eliot, Frank Humphreys Storer
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To confirm the presence of tartaric acid, or a tartrate, in any liquid supposed to contain it, a concentrated solution of acetate of potassium is added to the liquid, and the mixtura Digitized by Google { 68 tahtbates, — bohates. 81 violently shaken. The precipitate, when one forms, is a diffi- cultly soluble acid tartrate of potassium. The addition of an equal volume of alcohol increases the delicacy of the reaction. The more concentrated the solution to be tested the better. To prepare the re...quired solution of acetate of potassium at the moment of use, rub together in a dish half a teaspoonful of carbonate of potassium and as many drops of acetic acid as will dissolve three quarters of the carbonate ; throw the mixture on a small moistened filter and use the filtrate. Tartaric acid is a good substance from which to get these reactions. 68. Borates. — To confirm the presence of a borate, strong sulphuric acid is mixed with the dry substance under examination in quantity sufficient to make a thin paste, and an equal bulk of alcohol is added to the mixture.
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