In chemistry, base is a term applied to those compound substances which unite with acids to form salts. The most important bases are oxides of metals, and when brought in contact with acids their oxygen combines with the hydrogen of the acid to form water. They are divided into several sections, of which the most important are the alkalies. These substances are the hydrates of the so-called alkaline metals, and may be compared to water in which part of the hydrogen is replaced by a metallic radicle. Potash, for instance, is the hydrate of the metal potassium. The alkalies are readily soluble in water, restore the blue colour of reddened litmus, and give a green with red cabbage, dahlia, and other vegetable blues, and convert the yellow of turmeric into a brownish red. Most of the bases, however, are insoluble in water, and without any effect on vegetable colours.
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
SciTech
