A Dictionary of Chemistry and the Allied Branches of Other Sciences Volume 3 (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: ...converted into chloride of lead, peroxide of lead, and water: Pb'O4 + 4HC1-2PbCl + PbO1 + 2H O. By s UirgiT quantity of hydrochloric acid, into chloride of lead, chlorine gas, and water: Pb'O1 + 8HC1-3PbCl- + Cl- + 4H'0. 4. By chlorinc-waUr, into chlorine and peroxide of lead: Pb'O4 + Cl-PbCl + 2PbO-. Similarly with bromine-water (Lowig). Minium is not decomposed by mercurous uitrate or oxalic acid. (Levol.) Heated with strong sulphuric acid, it yields sulphate of lead and free oxygen. By nitric acid, dilute sulphuric acid, and likewise by weaker acids, such as ordinary aeetto acid, it is resolved into protoxide and peroxide, the former dissolving in the form of an ordinary lead-salt, while the latter remains undissolved. In glacial act tic acid, however, it dissolves completely; and when considerable quantities of it, but not quite sufficient fur saturation, are dissolved in that acid at 40, the liquid on cooling deposits prismatic crystals of acetate of peroxide of lead, while an acetate of the sesquioxide remains in solution (Jacquelain, J. pr. Chem. liii. 151). According to Schonbein (ibid. ixxxiv. 315), concentrated acetic acid shaken up for about 15 minutes with levigated minium, takes up about 9 per cent of it, forming a solution which is quickly decomposed by heat or by dilution, but appears to be stable at--18. Sulphuric acid added to this solution throws down all the protoxide of lead contained in it, leaving a pure solution of acetate of peroxide, which deposits the peroxide slowly at ordinary temperatures, quickly when warmed. Potash added to the solution of minium in acetic and, throwft down, not minium, but a mixture of the proto-and peroxides, which I'lues tincture of guaiacum and iodised starch-paste, reactions not produced by...