Engineering Chemistry a Manual of Quantitative Chemical Analysis
The book Engineering Chemistry a Manual of Quantitative Chemical Analysis was written by author Thomas Bliss Stillman Here you can read free online of Engineering Chemistry a Manual of Quantitative Chemical Analysis book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Engineering Chemistry a Manual of Quantitative Chemical Analysis a good or bad book?
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2 Five grams of drillings in an eight-ounce beaker are treated with thirty cc. Nitric acid (1. 20 sp. Gr. ) and heated till decom- position is complete and the free acid nearly all evaporated. When about five cc. Of the solution remain, add fifteen cc. Of water, and then add concentrated sodium hydroxide solution till nearly neutral ; fifty cc. Of sodium sulphide solution are then added, the mixture well stirred, then boiled gently for half an hour. The solution then contains the tin and antimo...ny. The precipitate, which contains the sulphides of lead and copper, is filtered on a nine cm. Swedish filter, and washed thoroughly with water containing one per cent, of the above sodium sulphide solution. The filtrate is received in a 300 cc. Beaker. Tin and Antimony. The filtrate is diluted to 200 cc. And boiled. Crystals of oxalic acid, C. P. , are cautiously added till the sodium sulphide is all decomposed and a milky separation appears, mixed with a precipitate which is usually at first black.
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