What do you observe when a metallic lead is treated with hot concentrated alkali
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This chapter elaborates on behavior of acids, alkalis, and salts. Acids are generally colorless liquids or white solids. Unripe fruits, such as green apples, and some plants have a sour or acid taste because they contain acids. An acid whose name you already know or can guess is found in oranges, lemons and other citrus fruits. Lactic acid occurs in sour milk and cheese. Acids make up a very important group of compounds. Like acids that have been studied at some length, alkalis are important compounds. Alkalis are so reactive that even if they resulted from some natural process, they would soon be transformed into other substances on contact with surrounding materials. The common behavior of acids as a class toward various kinds of substances is due to the presence in all acids of hydrogen and, in their aqueous solutions, of hydrogen ions. Calcium and barium hydroxides are only slightly soluble in water; that is to say their saturated solutions contain relatively little solute and so are dilute solutions
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