The Testing of Chemical Reagents for Purity
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, p. 246.
Bromine. See below, under " Quantitative Estimation. " Resublimed iodine must contain from 99 to 100 per cent.
Note. According to Meineke (J. S. C. L, 1893, p. 550) the moisture may be estimated by covering the iodiine with freshly ignited silver powder, and then igniting after combination has taken place. The remaining silver iodide is then weighed.
Quantitative Estimation.
The well-known method of dissolving a quantity of the sample in potassium iodide solution and titrating with -^... sodium thiosulphate is the one generally used. 1 c. C. Thiosulphate solu- tion = 0'012654 gm. Iodine.
In the quantitative analysis of resublimed iodine, the most practical method is to standardise the thiosulphate solution on iodine previously purified by Stas's process (drying over sul- phuric acid and fusing).
Topf (Zeit. F. Anal. Chem. , 1887, p. 288, et seq. ; and J. C. S. , 1887, A. , p. 997) estimates iodine in a commercial sample (con- taining chlorine) by dissolving the iodine in caustic soda solution, adding sodium bisulphite and ferric chloride, then excess of hydrochloric acid, and distilling till all the iodine has passed over into a solution of potassium iodide ; the solution is then titrated with thiosulphate in the ordinary way.
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You can find similar books in the "Read Also" column, or choose other free books by C Krauch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
, p. 246.
Bromine. See below, under " Quantitative Estimation. " Resublimed iodine must contain from 99 to 100 per cent.
Note. According to Meineke (J. S. C. L, 1893, p. 550) the moisture may be estimated by covering the iodiine with freshly ignited silver powder, and then igniting after combination has taken place. The remaining silver iodide is then weighed.
Quantitative Estimation.
The well-known method of dissolving a quantity of the sample in potassium iodide solution and titrating with -^... sodium thiosulphate is the one generally used. 1 c. C. Thiosulphate solu- tion = 0'012654 gm. Iodine.
In the quantitative analysis of resublimed iodine, the most practical method is to standardise the thiosulphate solution on iodine previously purified by Stas's process (drying over sul- phuric acid and fusing).
Topf (Zeit. F. Anal. Chem. , 1887, p. 288, et seq. ; and J. C. S. , 1887, A. , p. 997) estimates iodine in a commercial sample (con- taining chlorine) by dissolving the iodine in caustic soda solution, adding sodium bisulphite and ferric chloride, then excess of hydrochloric acid, and distilling till all the iodine has passed over into a solution of potassium iodide ; the solution is then titrated with thiosulphate in the ordinary way.
What to read after The Testing of Chemical Reagents for Purity?
You can find similar books in the "Read Also" column, or choose other free books by C Krauch to read onlineMoreLess
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