PART V.

CHEMICALS.

OXIDE OF SILVER.

Sym: AG + O.

Eq. 116. Silver 108 + Oxygen 8

Oxide of silver can be obtained from a solution of nitrate of silver, by the addition of a solution of pure potassa, or soda; oxide of silver is set free and falls as an insoluble brown powder; it should be repeatedly washed to remove all traces of the excess of potassa, or soda,and the nitrate of the alkali formed. After washing, it should be thrown upon a clean linen filter to drain, and afterwards dried; or it can be preserved in a moist state in a wide-mouthed bottle.

 

CHLORIDE OF SILVER.

Sym: AG + C.

Eq. 144. Silver 108 + Chlorine 36

Chloride of silver is most conveniently formed by the addition of a solution of common salt, (chloride of sodium,) to a solution of nitrate of silver. It falls readily as a white precipitate, and should be repeatedly washed, to free it from the excess of common salt, and the nitrate of soda formed during the process. After washing, it may be collected on a linen filter, and subjected to pressure to free it from moisture, and then dried, or it may be preserved in a moist state. It is soluble in ammonia, hyposulphite of soda, iodide and cyanide of potassium.

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