Exercises in chemistry by McPherson William 1864-1951 & Henderson William Edwards 1870-

Author:McPherson, William, 1864-1951 & Henderson, William Edwards, 1870- [from old catalog] joint author
Language: eng
Format: epub
Tags: Chemistry
Publisher: Boston, New York, [etc.] Ginn & company
Published: 1906-03-25T05:00:00+00:00

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Fig. 23

bottle in which to collect some of it; also test tubes each about one fifth full of a solution of one of the following compounds: copper sulphate, zinc sulphate, cadmium chloride, magnesium sulphate, sodium chloride. Now pour a few drops of a dilute solution of sulphuric acid (1 part * acid to 7 parts of water by vol-' ume) through the f mmel tube of the generator, adding more from time to time, if necessary, to maintain a gentle evolution of the gas (E). Collect a bottle of the gas by displacement of air, allowing the gas to flow in until it is ignited by a flame held at the mouth of the bottle (E). Account for the deposit on the sides of the bottle. Cause the gas to bubble for a few seconds through each of the solutions in the test tubes. Note the color of the precipitates obtained in the test tubes. Write the equations for all the reactions involved. Which ones of the solutions fail to give a precipitate ? How do you account for this ?

2. Pass a Uttle of the gas into some water in a small beaker. How does the solution compare with the so-called "sulphur water " of many springs ? Note the odor of the water. Drop a silver coin into it and account for the results. Why do certain foods, as eggs, blacken silver spoons ?

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