Instruction in chemical analysis (quantitative.) - Softcover

Inhaltsangabe

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. 1846 Excerpt: ...hydrogen, and the cobalt in the nltrate determined as directed 6, a, dd. The precipitate of the protoxide of manganese and nickel, mixed with oxide of zinc, is dissolved in acetic acid, the zinc precipitated by means of sulphuretted hydrogen, and the fluid filtered off from the precipitated sulphuret of zinc which is added to the first precipitate of sulphuret of zinc. The nickel and manganese in the filtrate are separated as directed 9. The weight of the manganese obtained is added to that of the manganese produced from the undissolved portion of the protocyanide of that metal. The results are perfectly accurate. APPENDIX. § 125. METHOD OF DETERMINING THE PROPORTIONAL AMOUNT OF PEROXIDE CONTAINED IN MANGANESE ORES. The natural manganese ores are compounds or mixtures of peroxide of manganese with the lower oxides of tins metal, and moreover peroxide of iron, alumina, sulphate of barytes, &c., &c. It is a matter of the greatest importance for merchants and manufacturers to know the exact proportion of peroxide of manganese present in any of the manganese ores, since the commercial value of these ores depends entirely upon the relative amount of peroxide which they contain. The following method of determining this amount, is the most simple in its execution, and at the same time the most accurate in its results. The following remarks will show and explain the principle upon which it is based. a. When oxalic acid or an oxalate is brought into contact with peroxide of manganese, in presence of sulphuric acid in excess, protosulphate of manganese is formed, and carbonic acid evolved, owing to the oxygen which we may assume to exist in the peroxide of manganese in combination with the protoxide of the metal, combining with the oxalic acid, and conse...

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.