BASIC CHLORIDES AND HYDROXIDES OF DYSPROSIUM (in Russian)
In determining the composition and activity product of basic salts and hydroxides of various metals it is necessary to measure the activity of the metal and anion and the pH of the solution. The activity of the chloride ion can be readily measured with a AgCl electrcde or a calomel electrode and the pH of the solution with a glass electrode. The activity of the metal can be calculated empirically if the activity coefficient of DyCl/sub 3/ is known for solutions containing NaCl. A plot of activity coefficients of various rare earth chlorides versus the ionic radius results in a series of continuous curves which can be used to estimate activity coefficients of specific rare earths for which the data is unavailable at present. The composition of freshly prepared dysprosium basic chloride corresponds to the formula Dy(OH)/sub 1.75/Cl/sub 1.25/ which has an activity product equal to 1 x 10/sup -15/. A small amount of Dy(OH)/sub 2.85/Cl/ sub 0.15/ is is also copre cipitated. With an activity of chloride ion from 0.00 to 0.70 the basic salt is Dy(OH)/sub 2/Cl. The activity product of Dy(OH)/sub 2/ Cl decreases with a decrease in activity of chlorine ion in solution. Aging always resulted in conversion of the basic chloride salt to the hydroxyl compound whose activity product was found to be equal to 1.3 x 10/sup -26/ irrespective of the activity of chloride ion in solution. (TTT)
- Research Organization:
- Inst. of General and Inorganic Chemistry, Academy of Sciences, Ukrainian SSR
- NSA Number:
- NSA-14-018946
- OSTI ID:
- 4168476
- Journal Information:
- Zhur. Neorg. Khim., Journal Name: Zhur. Neorg. Khim. Vol. Vol: 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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