Page:The British pharmacopœia.djvu/509

 APPENDIX.

I.

ARTICLES EMPLOYED IN CHEMICAL TESTING.

ACETATE OF SODIUM.

NaC2H3O2,3H2O.

(Also employed in the preparation of Acetic Ether.)

BENZOL. A colourless volatile liquid, obtained from coal tar, and consisting chiefly of benzol, C6H6. Specific gravity about 0.850.

BENZOLATED AMYLIO ALCOHOL. Mix together three volumes of benzol and one of amylic alcohol. Decant the supernatant fluid from any deposited water.

CHLOBIDE OF BARIUM.

BaCl2,2H2O.

COPPER FOIL. Pure metallic Copper, thin and bright.

FERRICYANIDE OF POTASSIUM.

Synonym.—Red Prussiate of Potash. K3Fe2C12N12.

Test.—Its aqueous solution gives no precipitate with a dilute solution of a pure ferric salt.

GOLD, FINE. Gold, free from metallic impurities.