. Introduction to inorganic chemistry . Fig. 33. Sodium, which is one of the con-stituents of common salt, may be usedto illustrate this sort of action. Asit is lighter than water, it must be held under the surface by means of a piece of wire-gauze in orderthat the gas may be collected (Fig. 34). Most of the water servesthe mechanical purpose of permitting the collection of the gas, andonly a small fraction of it takes part in the change. The solutionhas a soapy feeling and turns litmus from red to blue. This colorreaction is the precise opposite of that of acids (p. 93). Substances 98 INORGAN
. Introduction to inorganic chemistry . Fig. 33. Sodium, which is one of the con-stituents of common salt, may be usedto illustrate this sort of action. Asit is lighter than water, it must be held under the surface by means of a piece of wire-gauze in orderthat the gas may be collected (Fig. 34). Most of the water servesthe mechanical purpose of permitting the collection of the gas, andonly a small fraction of it takes part in the change. The solutionhas a soapy feeling and turns litmus from red to blue. This colorreaction is the precise opposite of that of acids (p. 93). Substances 98 INORGANIC CHEMISTEY causing these two effects are called alkalies. Evaporation of theresulting very dilute solutipn reveals the sodium hydroxide, thealkali, as a white solid. With Bteam at a red heat, metals like iron, zinc, and magnesium. Fio, 34. interact vigorously. The metal is placed in a tube in which it can bestrongly heated (Fig. 35^. The steam, generated in a flask, enters at
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