Summary
As shown in the above investigations, chromous sulphate can be used for the quantitative reduction of compounds containing nitro, nitroso, quinoid, and azo groups. In the case of the first three, the estimations can be carried out by either of the two methods, direct titration by using neutral red, phenosafranine orp-ethoxychrysoidine as internal indicators, or by adding excess of chromous sulphate and titrating the excess with ferric solution, using thiocyanate as indicator. The comparative study of reduction of azodyes shows that the dyes can be estimated quantitatively with chromous sulphate as well. It is also possible to estimate the carbohydrates, since the unused copper sulphate can be directly titrated against chromous sulphate in presence of neutral red or phenosafranine as indicator. The results are fairly satisfactory and within experimental error (± 0.9°/0).
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The author is highly indebted to Dr. R. C. Mehrotra, Professor of Chemistry, Gorakhpur University, for his helpful suggestions and keen interest in the work.
Part VII: See. Z. analyt. Chem. 164, 314 (1958).
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Tandon, J.P. Studies in bivalent chromium salts. Z. Anal. Chem. 167, 184–192 (1959). https://doi.org/10.1007/BF00457811
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DOI: https://doi.org/10.1007/BF00457811