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For chemical purposes, water is purified by distillation. If the intermediate portion only of the distillate is collected in good glass bottles, previously well steamed out to remove the alkaline layer from the glass, the water is very nearly pure. A copper vessel, with a pure tin or a copper condenser without brazing, is the best apparatus to use. Still purer water is obtained by destroying the nitrogenous organic matter, which gives off traces of ammonia on distillation, by passing chlorine through boiling distilled water for half an hour. The chlorine is boiled out, pure potash and potassium permanganate are added, and the water distilled, the first half being rejected, and a quarter only of the remainder collected. The process is repeated with this fraction.
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