. The Pharmaceutical era. y of calcium phosphate, is treated with di-lute sulfuric acid, by which means a mixture of calciumacid phosphate and sulfate are obtained. Ca3(P0,), + 2HjS0, = CaH.(P0j2 -I- solution of the acid phosphate is poured off fromthe precipitated calcium sulfate, and the solid impuritiesof the bone ash, evaporated to dryness and heated to red-ness to produce the metaphosphate. CaH,(PO,), = CaCPOa)^ + 2H, metaphosphate is then mixed with charcoal andsand and heated in earthenware retorts, the phosphorusbeing reduced and distilling over, while calcium silicatei
. The Pharmaceutical era. y of calcium phosphate, is treated with di-lute sulfuric acid, by which means a mixture of calciumacid phosphate and sulfate are obtained. Ca3(P0,), + 2HjS0, = CaH.(P0j2 -I- solution of the acid phosphate is poured off fromthe precipitated calcium sulfate, and the solid impuritiesof the bone ash, evaporated to dryness and heated to red-ness to produce the metaphosphate. CaH,(PO,), = CaCPOa)^ + 2H, metaphosphate is then mixed with charcoal andsand and heated in earthenware retorts, the phosphorusbeing reduced and distilling over, while calcium silicateis left behind in the retort. (Fig. 33.) CalPOa)^ + 50 + SiOj = CaSiO, -I- SCO + P,.On account of its ready inflammability the phosphorusvapor must, of course, be condensed and the solid pre-served under water. Description and Physical Preperties.—Phosphorus is knownin three well marked allotropic modifications, ocfa/iedra?a7norphoi(sand the rhovibohcdral or mctaUic. The octahedral, or colorless, modification is commonly. December 2, 1897.] THE PHARMACEUTICAL ERA. 831
Size: 1292px × 1935px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
