Phosphoric, Vanadic, Arsenic, and Antimonic Acids -Nitrous, Phosphorous, Arsenious Acids-Phos-phatic Acid-Hyponitrous and Hypophosphorous Acids, and their Salts.

The remaining hydroxides, which all exhibit well-marked acid functions, may be divided into two classes, those of elements of odd valency, and those derived from elements of even valency. A scheme has already been given on p. 71, which illustrates the derivation of the acids of the halogens from the imaginary hydroxides corresponding to X^vn, Xv, X¹¹¹, and X¹, where X stands for halogen, and the Roman numerals for the valencies in the compounds.