Abstract
The preparation of sodium polyuranates by mixing sodium hydroxide solutions with uranyl nitrate and vice versa was studied by potentiometric titration. Points of inflection indicated the presence of polyuranates with different Na : U ratios and of a polyuranate with the empirical formula (UO 3H 2O) 5N 2O 3. Polymerization and hydrolysis of uranyl ions in the solution during titration were indicated by changes in the absorption spectra and in pH. Solid polyuranates with empirical formulae (UO 3H 2O) 5N 2O 5 and (UO 3H 2O) n Na 2O were obtained, n having values from 16 to 3. The dependence of the polyuranate composition on the pH of the titration solutions was investigated. Polyuranates of formulae (UO 3H 2O) 5N 2O 5 and (UO 3H 2O) n Na 2O ( n = 16 and 5) have similar orthorhombic structures. The unit cell has dimensions a = 7·09 ± 0·02 Å, b = 9·55 ± 0·02 Å, c = 5·11 ± 0·06 Å. The structure of polyuranates with n < 5 is different.
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