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Home > History and Archaeology > History > A Course of Instruction and System of Procedure in Qualitativ Chemical Analysis: (English)
A Course of Instruction and System of Procedure in Qualitativ Chemical Analysis: (English)

A Course of Instruction and System of Procedure in Qualitativ Chemical Analysis: (English)

          
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About the Book

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. 1912 Excerpt: ...(potassium cadmicyanide), since its complex anion has a much smaller ionization tendency than the cation Cd(NH3)4++; thus in a normal KCN solution the ratio of the concentration of the complex anion to that of the simple Cd++ ion is about 1017. Yet this complex anion is sufficiently dissociated into Cd++ to cause the solution to become supersaturated with CdS when an alkaline sulfide is added. 4. A very small black precipitate (which may be due to HgS or PbS) may sometimes be produced in the final test for cadmium with H2S; but, provided the analysis has been properly conducted, not in sufficient quantity to prevent the yellow color of 1 or 2 mg. of CdS from being seen. In case a black precipitate is produced, and (hus prevents a positive conclusion as to the presence or absence of a little cadmium, the precipitate may be treated, in order to eliminate the black sulfide, as follows: Boil the precipitate gently for about 5 minutes in a covered casserole with about 15 cc. of a mixture of one volume of 6-normal H2SO4 with four volumes of water, filter, cool the filtrate, add to it three times its volume of water, and pass H2S into it for 5-10 minutes. A yellow precipitate of CdS should then be obtained, if cadmium is present. REPRECIFITATION OF THE TIN-GROUP. Procedure 41.--Reprecipitation of the Tin-Group.--Dilute in a small flask the first portion of the ammonium sulfide solution (P. 22) with about 20 cc. water, make it distinctly acid with HCl, and warm it slightly for 5 minutes with frequent shaking to coagulate the precipitate. (Fine, not flocculent, white or pale yellow precipitate, absence of Tin-group; deep yellow or orange, flocculent precipitate, presence of Tin-group.) Treat the second portion of the ammonium sulfide solution (P. 22) in the same way...


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Product Details
  • ISBN-13: 9781130536935
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 44
  • Series Title: English
  • Weight: 95 gr
  • ISBN-10: 1130536939
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 189 mm

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