Publisher's Synopsis
Excerpt from A Manual of Chemistry, Vol. 2 of 2: Containing the Principal Facts of the Science, Arranged in the Order in Which They Are Discussed And; Illustrated in the Lectures at the Royal Institution of Great Britain
When the tartrate of manganese and potassa is intensely heated in a wind-furnace it furnishes globules of metallic man ganese; and as this salt is easily Obtained in a state of purity, its decomposition is perhaps the simplest process for obtaining the pure metal, care being taken to exclude foreign substances derivable from the fuel or from the crucible.
Manganese is a hard gray metal, exhaling a peculiar odour when handled or breathed upon it is brittle, and has a gra mular fracture; its specific gravity is When pure, it does not affect the magnetic needle. It is best preserved in naphtha; for in the air it soon crumbles down into a black powder, and undergoes the same Change in water, with the evolution of hydrogen gas. It may also be conveniently kept in a small glass tube hermetically sealed.
Manganese and Oxygen. -there are four compounds of manganese and oxygen, three of which are oxides, and one an acid.
Protoxide of Manganese is obtained by passing a current of hydrogen over the pure deutoxide or peroxide contained in a porcelain or iron tube, exposed to a heat gradually raised to bright redness: water is formed, and a dingy green powder remains in the tube, which is the protoxide.
It may also be procured by mixing the peroxide with half its weight of muriate of ammonia, and projecting the mixture in successive portions into a red-hot crucible; the product is lixiviated, and the solution of chloride of manganese, thus obtained, is decomposed by the addition of carbonate of po tassa; the precipitate is collected, washed, dried, and exposed, out of the contact of air, to an intense heat; or it may be heated in a tube, through which a current of hydrogen is passed.
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