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The Theory and Practice of Electrolytic Methods of Analysis

The Theory and Practice of Electrolytic Methods of Analysis


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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. 1898 Excerpt: ... all the manganese from this solution in three and a half or four hours. The E.M.F. required will be 4 volts. In this case there is no necessity to add sulphuric acid during the course of the electrolysis. This method gives better results than that with nitric acid, but the deposit in this case is still unsatisfactory as regards its adherence to the electrode. Latterly acetic acid has been again recommended for employment in place of the above two acids. In order to 1 Zeitschr.f. anal. Chem. 23, 581. carry out an electrolysis with this acid, '30 grm. manganese sulphate is dissolved in about 125 c.cms. water, and 25 c.cms. 60 per cent. acetic acid is added. The acid solution is heated to 50 or 60 C., and is electrolysed with a current of '30 ampere. The E.M.F. required under these conditions will be from 4'3 to 4'9 volts, and the whole of the manganese will be separated as peroxide in from two to two and a half hours. The deposit is no better as regards adherence to the electrode than that obtained from the preceding solution. The same results are obtained by use of a solution containing excess of sodium pyrophosphate and free ammonium hydrate. All the manganese will be deposited in about two hours with an E.M.F. of 4'1 volts and a current of '30 ampere, but in this case the deposit is just as liable to part from the electrode as in the previous examples. Additions of free tartaric, oxalic, milk, or phosphoric acids delay the deposition of the peroxide. In order to obtain adherent deposits of larger amounts of manganese peroxide, Engels has recently suggested a method of aiding the separation by the addition of other chemicals.1 To a solution of 1 grm. manganese sulphate in water, a solution of 10 grms. ammonium acetate and of 1'5 to 2 grms. chrome alum is a...


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Product Details
  • ISBN-13: 9781154869491
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1154869490
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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