Add time:08/06/2019         Source:sciencedirect.com

The enthalpies of solutions of La(OH)3 (cr), Nd(OH)3 (cr), Sm(OH)3 (cr) and Am(OH)3 (cr) and of La (cr), Nd (cr) and Sm (cr) in 6.00 mol dm−3 HCl have been measured at 298.15 K. From these measurements, the following standard molar enthalpies of formation ΔfHmo (kJ mol−1) are calculated as La(OH)3 (cr): −(1416.7 ± 1.3); Nd(OH)3 (cr): −(1415.6 ± 2.3); Sm(OH)3 (cr): −(1406.6 ± 2.2); Am(OH)3 (cr): -(1343.6 ± 1.8). From these values combined with measured and estimated entropy values, the solubility products of the hydroxides are obtained. These results are compared with existing literature data and thermodynamic relationships between the hydroxides and the corresponding hydroxycarbonates are established.

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