AIDS to Chemistry (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...silver is melted in the air, it absorbs twenty-two times its bulk of oxygen, the fis being again evolved upon the solidification of the metal, his process is known as "spitting." Silver is usually alloyed with small quantities of copper for preparing articles of plate and coinage. English silver money contains 7-5 per cent, of copper. Silver With Oxygen forms three oxides, viz.--(1) Silver suboxide, Ag40, a black powder. (2) Silver monoxide, Ag20, a brown substance obtained by the addition of liquor potassse to a solution of nitrate of silver. (3) Silver dioxide, Ag202, a black powder, prepared when ozone acts upon metallic silver. Silver Nitrate, AgN03, Is the most important of the soluble salts of silver. It is prepared by the action of nitric acid upon metallic silver and evaporating the solution. It then appears as large translucent tabular crystals. Upon heating, nitrate of silver fuses easily, and when cast into sticks it is known by the name of "lunar caustic." It blackens the skin. Silver Chloride, AgCl, Is the most important insoluble salt of silver. It occurs native as "horn silver," and may be obtained as a white curdy precipitate when a silver salt and a soluble chloride are brought into contact. By exposure to light, this salt becomes of a purple tint, increasing in shade according to the length of time of its exposure. Chloride of silver is readily soluble in hyposulphite of sodium. Silver Bromide, AgBr, Is a white substance, obtained by adding an alkaline bromide to silver nitrate. Silver Iodide, Agl, Is a yellow powder. Silver Sulphide, Ag2S, Occurs native as "silver-glance," and may be obtained as a black precipitate by passing sulphuretted hydrogen gas through a solution of a salt of silver. Tests fo...