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1. |
THE PRODUCTION OF ETHANE, QUINHYDRONE, AND POTASSIUM CUPRIC CYANIDE BY A-C. ELECTROLYSIS |
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Canadian Journal of Research,
Volume 17b,
Issue 6,
1939,
Page 167-177
J. W. Shipley,
M. T. Rogers,
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摘要:
The quantitative production, of ethane, quinhydrone, and potassium cupric cyanide by a-c. electrolysis was studied in respect to conditions affecting yield. It was found that a good yield (about 90%) of quinhydrone was obtained by a-c. electrolysis, at low frequency and moderately high current density, of an aqueous solution of hydroquinone. This method of preparation has a distinct advantage in respect to space-time yield over the method of d-c. electrolysis. The current yield of potassium cupric cyanide at low current density (0.3 to 1.0 amp. per cm.2) using a.c. was in the neighbourhood of 88%. A-c. electrolysis was not found to indicate any particular advantage over d-c. electrolysis, as far as could be ascertained by comparing the ethane efficiency of the two processes.
ISSN:1923-4287
DOI:10.1139/cjr39b-027
出版商:NRC Research Press
年代:1939
数据来源: NRC
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2. |
FURTHER OBSERVATIONS ON THE DETERMINATION OF PHOSPHATE BY PHOTOELECTRIC COLORIMETRY |
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Canadian Journal of Research,
Volume 17b,
Issue 6,
1939,
Page 178-191
G. R. Smith,
W. J. Dyer,
C. L. Wrenshall,
W. A. De Long,
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摘要:
A study of factors affecting the ceruleomolybdate reaction for phosphate is reported. The concentrations of stannous and stannic ions, the presence of extraneous salts, and temperature are important factors affecting the intensity and stability of the blue colour.The stannous chloride reagent should be preserved from oxidation by storing it under hydrogen.The interference by ferric iron is due largely to its reaction with the reducing agent, and may be avoided by diluting the sample to contain 0.1 p.p.m. of phosphorus and using two or three times the usual quantity of stannous chloride.
ISSN:1923-4287
DOI:10.1139/cjr39b-028
出版商:NRC Research Press
年代:1939
数据来源: NRC
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3. |
s-DIPHENYLGUANIDINE AS AN ACIDMETRIC STANDARD |
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Canadian Journal of Research,
Volume 17b,
Issue 6,
1939,
Page 192-197
J. W. Young,
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摘要:
s-Diphenylguanidine may be purified by recrystallization to provide a satisfactory acidmetric standard. The results of titration of an alcoholic solution of the base to pH 5.2 forNacid or 5.6 forN/10 acid agree within experimental error with values obtained with sodium carbonate or borax. Three methods of preparing borax containing exactly 10 molecules of water of crystallization have been compared,viz., drying over sodium bromide, drying over a saturated solution of sugar and salt, and washing with alcohol and ether. Satisfactory products resulted, but they were found to be unstable on storage. Sodium bicarbonate has been found to be stable on long storage. The density ofs-diphenylguanidine at 20 °C. was found to be 1.19.
ISSN:1923-4287
DOI:10.1139/cjr39b-029
出版商:NRC Research Press
年代:1939
数据来源: NRC
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