Qualitative Chemical Analysis And Laboratory Practice
Qualitative Chemical Analysis And Laboratory Practice
Thomas Edward Thorpe
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When dry, put the silica into a stoppered bottle, and preserve it. In this lesson you learn (1) By what method hydrofluoric acid is prepared. (2) That this acid etches glass, and the way in which it does this. (3) By what method silicon fluoride is prepared. (4) That this gas is decomposed by water ; and (5) That hydrofluosilicic acid is thus produced. (6) That a solid may be separated from a liquid by filtration. (7) What is the use of the wash-bottle. LESSON XVII. PREPARATION AND PROPERTIES O...F METHANE (MARSH GAS). INTRODUCE into an iron tube about 20 cm. Long and 5 cm. Diameter (see fig. 28) a mixture of 8 grams of dry sodium ace- tate with 8 grams of caustic soda previously strongly heated on an iron plate and 12 grams of lime. Fit in a good cork with a delivery tube, arrange the trough and a bottle to collect the gas ; now heat the tube, beginning at the F 66 Qualitative Chemical Analysis. upper part, and heating gradually downwards. As the gas does not come off until a pretty high temperature is reached, FIG 28 it: is P referable to use such an apparatus as that described, than to heat the mixture in a glass flask, which is very liable to crack.
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