Preparation of Basic Oxides-Pro* perties of the Basic Oxides and Hydroxides-Sulphides - The " Solubility-Product" - Basic Oxides and Hydroxides of Complex Groups: Alcohols, Aldehydes, Ethers; and Sulphines, Amines and Phosphines.The Oxides and Hydroxides, Sulphides and Hydrosulphides, Selenides and Tellurides

Owing to the dyad valency of oxygen, sulphur, selenium, and tellurium, compounds of these elements are more numerous than those of the halogens. And whereas double halides of hydrogen and other elements are not numerous, being confined to such bodies as H₂SiF₆, HBF₄, H₂PtCl₆, and a few others, those of the oxides are very numerous, and form two important classes, the " hydroxides" and the "acids."