A Dictionary of Applied Chemistry by T E. Thorpe

By T E. Thorpe

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Cathode. As is shown in Fig. 13, the cell consists of an in CENTRE CORE OF ANODE. CA THODE ) RUN OFF VPE. FIG. 13. outer trough in which is placed the inner vessel, formed by the porous diaphragm. The cathode or the wire netting is, of course, on the outside. The inner or anode compartment is filled with brine ; the outer cathode compartment is empty, but the wire gauze is continually washed with either steam or a water spray to remove the alkali as it is formed. The cell is usually worked with an atmosphere of C0 2 in the compartment, and thus The amalgam, when sufficiently highly saturated with the alkaline metal, is replaced by fresh mercury and the amalgam itself decomposed by water, with the liberation of and the formation of a caustic alkaline solution.

13070 of J888) describe two apfor FIG. 23. is condensed and collected after leaving the cylinder D, as in Fig. 22. As in Fig. 22, the compressed chlorine has to be kept warm in the compression vessel, and this is done by the water-jacket G. Marx (Eng. Pat. 7058 of 1890) proposes to make the liquid chlorine direct by the decomAs far position pressure of chlorine hydrate. CHLORINE. 26 as is known, this ingenious process has not been constant presence of such excess of lime can be upheld. All these formulae, however, leave out of account the water of hydration present in thu lime before chlorination, which is not expelled, and Avhich is absolutely necessary for the formation of the bleaching powder.

26. The ends are sometimes secured by a coat powder both by n n n n n n n n n n its carbonic into a pasty mass. Mixed with a little water, it forms a stiff paste, with a perceptible swelling and rise of temperature ; this is probably caused by the transformation of 2CaOCl 2 into Ca(OCl) 2 acid. and The packages must be kept in cool, dry places both rain and sun would quickly spoil the Bleaching powder decomposes gradually even in closely stoppered bottles or well-protected The presence of light, heat, moisture, casks.

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