177 



89. SODIUM HYPOPHOSPHITE. Na P H 9 O a . 



a. In granular powder. 

 'JO. HYPOSULPHATE. Na 2 S 2 8 . (Dithionate of Sodium.') 



a. Crystals. 



91. HYPOSULPHITE. Na<j S 3 O s , 5H 3 0. (Thiosulphate of Sodium, 



Sulphosulphate of Sodium, Antichlor.) 



a. Crystals, a commercial specimen. 



b. Ditto, purified. (Hyposulphite of Soda, B. P.) 



92. LACTATE. NaHCgH^Og. 



a. In semi- crystalline, mamillated pieces. 



93. NITRATE. NaN0 3 . (Cubic Nitre, Chili Saltpetre.) 



a. Native. (Caliche.') 



b. Impure, in crystals. 

 e. Pure ditto. 



Note. Specimen a came from Peru. See P. J. [3] , vol. vi., p. 264. 



94. NITRITE. NaN0 3 . 



a. Impure, fused. 

 Note This salt is rarely free from nitrate. 



95. NITRO-PRUSSIDE. Na^ (N 0) Fe Cy 5 ,2H 2 0. (Nitro-ferroci/anide of 



Sodium.') 

 a. Crystals. 

 Note. See Foume*, Chemistry, p. 855. 



96. OXIDE. Nag 0. (Sodium Monoxide, Anhydrous Soda.) 



a. Anhydrous, made from sodium. 



97. PHOSPHATE. Na 2 H P 4 , 12H 2 0. (Tribasic Phosphate of Soda, 



Disodic OrthopJtosphate.) 



a. Crystals. 



b. In larger crystals. 



Note. Specimen 6 contains some sulphate and carbonate. Crystals 

 containing these impurities are generally larger than those of the pure 

 salt. For fig. of crystal, see Phillips, Trantl. Pharm., 1851, p. 362. 



98. AMMONIO- PHOSPHATE. Na (N H 4 ) H P 4 , 4H 2 0. (Microcosmic 



Salt, Phosphorous Salt, Sodium, Ammonium, and Hydrogen 



Phosphate.) 



a. Crystals. 



99. PYROPHOSPHATE. Na 4 P 2 7 , 10H 2 0. 



a. Granular powder. (Tetrasodic Pyrophosphate.) 



b. Crystals. 



100. SILICATE. (Soluble Glass, Water Glass.) 



a. Crude, in a fused mass. 



b. Pure. 



Note. This substance varies in composition. 



N 



