. Introduction to inorganic chemistry . and the phosphorus is caught under water: Ca8(P04)5j + SSiOi, -f- 50 -^ SOaSiOj + 600 -|- 2P. We may regard the phosphate as being^ composed of two oxides, 30aO,PjOj. It thus appears that the calcium oxide has united with the PHOSPHORUS 457 silica, which is an acid anhydride (c/. p. 381) : CaO + SiO^ —> CaSiOj,while the phosphoric anhydride has been reduced. The phosphorus, after purification, is cast into sticks in tubes oftin or glass, standing in cold water. The Electric Furnace. — By an electric furnace is understood anelectro-thermal arrangement
. Introduction to inorganic chemistry . and the phosphorus is caught under water: Ca8(P04)5j + SSiOi, -f- 50 -^ SOaSiOj + 600 -|- 2P. We may regard the phosphate as being^ composed of two oxides, 30aO,PjOj. It thus appears that the calcium oxide has united with the PHOSPHORUS 457 silica, which is an acid anhydride (c/. p. 381) : CaO + SiO^ —> CaSiOj,while the phosphoric anhydride has been reduced. The phosphorus, after purification, is cast into sticks in tubes oftin or glass, standing in cold water. The Electric Furnace. — By an electric furnace is understood anelectro-thermal arrangement in which the heat produced by someresistance offered to the current,such as that of an air-gap betweenthp carbons, is used to produce chem-ical change. Electrolysis plays nopart in the phenomena, and analternating current, which can pro-duce no electrolytic decomposition,is generally employed. The re-stricted area within which the heatis developed makes possible theattainment of a high temperature(see Calcium carbide). I I I I I r. Fia. 90. Physical Properties. —Thereare two perfectly distinct kinds ofphosphorus, known as ordinary, oryellow phosphorus, and red phos-phorus. Yellow phosphorus, pre-pared as described above, is at first transparent and colorless, but after exposure to light acquires asuperficial coating of the red variety. It melts at 44° and boils at269° (according to some authorities, at 287°). Its molecular weight is,at 313°, 128, and at a red heat As the atomic weight is 31, theformula, within this range, is P^. At 1700° the value is held toindicate partial dissociation into Pj. In solution the formula is P^.Yellow phosphorus is very soluble in carbon disulphide, less soluble inether and other organic solvents, and insoluble in water. It is ex-ceedingly poisonous, less than g. being a fatal dose. Continuedexposure to its vapor causes necrosis, a disease from which match-makers are liable to suffer. The jawbones and teeth are particul
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