Summary
Manganate solutions prepared by the reduction of permanganate with formic acid in 1 M NaOH are fairly stable in a concentration of 0.015 M in presence of 1 M NaOH. They can be titrated successfuly with arsenite in the presence of telluric acid but not in its absence owing to the sluggishness of the reaction. Titration of arsenite with manganate yields always lower results deviating by ∼ 0.77% from the theoretical values in presence of telluric acid and 0.1–0.2 M NaOH. Much earlier end points with errors amounting to − 17 or − 38% are obtained in the absence of telluric acid.
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References
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This work was started during 1957. Since that time the reactions of manganate with arsenite, tellurite, bivalent manganese and hydrogen peroxide were studied in our laboratory. While this work was prepared for publication den Boef et al. published their first investigation in the same line in 1959.
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Issa, I.M., Khalifa, H. & Allam, M.G.E. Oxidation with manganate solutions. Z. Anal. Chem. 172, 21–28 (1960). https://doi.org/10.1007/BF00451784
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DOI: https://doi.org/10.1007/BF00451784