Studies of Various Methods for the Separation of the Common Elements into Groups. The Activity Coefficients of Hydrochloric Acid in Solutions Containing Sodium Dithionate Perchloric Acid

Citation

Barton, Robert C. (1933) Studies of Various Methods for the Separation of the Common Elements into Groups. The Activity Coefficients of Hydrochloric Acid in Solutions Containing Sodium Dithionate Perchloric Acid. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/gqdr-yw32. https://resolver.caltech.edu/CaltechTHESIS:10212024-182807074

Abstract

Studies of Various Methods for the Separation of the Common Elements into Groups

I. Data are presented for the separation of chromium, aluminum and iron from manganese, nickel, cobalt and zinc by the various modifications of the ammonia separation. Under the best possible conditions it was found that the separation of nickel, cobalt and zinc from chromium. and aluminum was unsatisfactory for quantitative work although the Ardagh modification of the method improved the aluminum separations.

II. An experimental study of the separation of manganese, iron, cobalt and nickel from aluminum, chromium and zinc by means of sodium hydroxide and peroxide has been made. The separations are unsatisfactory quantitatively.

III. It has been found that zinc, cobalt, nickel and iron (the Zinc Group} can be separated from aluminum, chromium and manganese (the Aluminum Group} by precipitation with hydrogen sulfide from a solution having a controlled excess of sodium hydrocarbonate and sufficient oxalate to prevent the precipitation of aluminum and chromium. The separations are very satisfactory quantitatively.

The Activity Coefficients of Hydrochloric Acid in Solutions Containing Sodium Dithionate and Perchloric Acid.

The effects of added sodium dithionate and added perchloric acid upon the activity coefficients of hydrochloric acid in aqueous solution were determined at 25°C up to an ionic strength somewhat greater than unity.

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