A Systematic Course of Qualitative Chemical Analysis of Inorganic And Organic Su
A Systematic Course of Qualitative Chemical Analysis of Inorganic And Organic Su
Henry W Henry William Schimpf
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Borate. Chromate. INORGANIC BASES AND ACIDS. 97 CHARACTERISTIC TESTS FOR ACIDS OF GROUP B. 105. SULFURIC ACID AND SULFATES. 30. SULFURIC ACID (H 2 S0 4 ) a heavy, oily, colorless liquid. Upon adding water to the acid considerable heat is produced. 31. Charring Test. A piece of paper or wood placed in strong sulfuric acid is charred, or if the dilute acid is evaporated in contact with a little white sugar the latter is charred. This charring is due to the abstraction of the elements of water. 32.... Precipitation Tests. Dilute sulfuric acid gives a white precipitate with barium and lead salts. 33. SULFATES. Sulfates are soluble in water with the excep- tion of basic sulfates and those of barium, strontium, and lead. Silver sulfate and calcium sulfate are only slightly soluble. 34. Barium Chlorid Test. BaCl 2 added to a solution of a sulfate precipitates white BaS0 4 insoluble in dilute acids even on boiling. The sulfate solution should be acidified with dilute hydrochloric acid before the barium chlorid is added: K 2 1 S0 4 + BaCl 2 = BaS0 4 + 2KC1.
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