Introduction to the study of inorganic chemistry / by William Allen Miller.

  • Miller, William Allen, 1817-1870.
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: Introduction to the study of inorganic chemistry / by William Allen Miller. Source: Wellcome Collection.

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    through muslin. Add a little solution of corrosive sublimate : an immediate coagulation of the white of egg will occur. Such coagulated albumen is not liable to putrefy. Wood, cordage, and canvas are sometimes soaked in a solution of the salt, and are thereby rendered less likely to decay. Mercuric Iodide (Hgiz).—Add to a dilute solution of potassic iodide a few drops of a solution of corrosive sub- limate: a yellow precipitate of mercuric iodide, becoming salmon-coloured, and ultimately brilliant scarlet (HgL), is formed. This iodide is redissolved by an excess of potassic iodide, or by one of corrosive sublimate : with the iodide it forms a soluble double salt (KI, HgL), and a similar double salt with corrosive sublimate (Hgiz, aHgCb). Exp. 258.—Heat a little of the mercuric iodide in a dry test- lube : it will melt and sublime, and condense in yellow crystals. Shake out the sublimate upon a piece of paper, and draw a glass rod firmly across the heap of crystals : a scarlet colour will be produced. This change is brought about by the conversion of the yellow rhombic plates into a dimorjthous red octahedral form by the molecular disturbance occasioned by pressure. Tests for Mercury.—All the salts of this metal are vola- tilised by heat. They are all reduced to the metallic state, whether .soluble or insoluble, by being boiled with an e.vcess of stannous chloride. If a slip of copper be boiled in a .solution of a salt of mercury, it becomes coated with a white amalgam ; and if the copper be heated in a small tube to redness, globules of mercury are driven off, and condense upon the sides. Mercurous salts give a black ])recipitate with sulphuretted hydrogen ; a white, consisting of calomel, with a soluble chloride ; and this white precipitate is black- ened by the addition of ammonia, but is not redissolved by it. It is soluble in chlorine water or in boiling nitric acid. Pfcrcuric salts give a yellow precijiitate with solution of potash, and a white one with ammonia ; with sulphuretted