ION SOLVATION IN SALTS OF BIOLOGICALLY IMPORTANT RARE EARTH METALS WITH AQUEOUS SUGAR ALCOHOL (SORBITOL) MIXED-SOLVENT SYSTEMS

Figures & data

Fig. 1 Variation of ultrasonic velocity, U vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.

Table 1 Experimentally determined ultrasonic velocity, U, density, ρ, viscosity η, and calculated values of apparent molar volume, ϕ_v, Relative association, R_A, solvation number, Sn , and relaxation time, τ of lanthanum(III) chloride in water and different proportions of sorbitol-water mixture at 303.15 K.

Conc. (mol. dm^−3) of LaCl3 (soln.)	U (m.s^−1)	ρ × 10^−3 (kg m^−3)	η × 10^3 (kg m^−1 s^−1)	ϕV × 10^3 (dm^3 mol^−1)	−ϕK × 10^9 (N^−1 dm^5 mol^−1)	RA	Sn	τ × 10^13 (s)
Water
0.0	1499.0	0.9960	0.7979					4.7536
1.0	1571.3	1.1623	1.1823	79.28	6.2929	1.1487	11.20	5.4936
1.1	1577.2	1.1743	1.2183	83.51	5.7677	1.1591	10.67	5.5610
1.3	1585.9	1.2053	1.3346	84.60	5.2154	1.1876	9.90	5.8703
1.5	1601.0	1.2335	1.5079	87.28	4.8025	1.2115	9.35	6.3590
1.7	1618.8	1.2534	1.6119	94.23	4.164	1.2265	8.70	6.5435
2.0	1634.2	1.2973	1.7883	95.00	3.6646	1.2655	7.92	6.8824
1.0% (w/V) Sorbitol
0.0	1518.0	1.0104	0.8100					4.6387
1.0	1575.1	1.1733	1.2207	78.27	5.2298	1.1470	9.66	5.5921
1.1	1580.9	1.1823	1.2602	85.11	6.0550	1.1543	9.19	5.6859
1.3	1597.0	1.2147	1.3694	84.68	5.7572	1.1820	9.03	5.8939
1.5	1610.2	1.2416	1.4807	87.99	5.1418	1.2049	8.54	6.1344
1.7	1619.0	1.2664	1.6413	91.75	4.4629	1.2267	7.94	6.5927
2.0	1639.2	1.3063	1.8575	94.65	3.8634	1.2602	7.34	7.0578
2.5% (w/V) Sorbitol
0.0	1527.0	1.0180	0.8492					4.7709
1.0	1581.9	1.1773	1.2895	76.97	4.9462	1.1429	9.33	5.8353
1.1	1588.0	1.1886	1.3333	81.71	4.5260	1.1524	8.98	5.9312
1.3	1602.2	1.2182	1.4712	83.73	4.2739	1.1776	8.68	6.2745
1.5	1617.1	1.2472	1.6025	85.64	4.0340	1.2019	8.37	6.5521
1.7	1623.2	1.2731	1.6901	88.89	3.4951	1.2254	7.74	6.7197
2.0	1644.0	1.3142	2.0148	91.47	3.1336	1.2595	7.23	7.5634
5.0% (w/V) Sorbitol
0.0	1535.0	1.0285	0.8955					4.9274
1.0	1591.0	1.1811	1.3831	76.89	4.6429	1.1347	9.02	6.1683
1.1	1599.2	1.1951	1.4428	78.96	4.5029	1.1462	8.90	6.2960
1.3	1608.2	1.2261	1.5676	79.99	4.1769	1.1738	8.45	6.5929
1.5	1623.9	1.2531	1.7032	83.40	3.8957	1.1957	8.13	6.8717
1.7	1631.8	1.2763	1.8447	88.22	3.3281	1.2158	7.52	7.2356
2.0	1651.0	1.3223	2.1617	88.24	3.1185	1.2548	7.09	7.9970
10.0% (w/V) Sorbitol
0.0	1548.0	1.0454	0.9994					5.3193
1.0	1598.2	1.1912	1.5525	73.75	4.0989	1.1274	8.08	6.8054
1.1	1607.1	1.2045	1.6252	76.17	4.0225	1.1379	8.05	6.9667
1.3	1618.0	1.2338	1.7757	78.06	3.7745	1.1629	7.75	7.3300
1.5	1631.0	1.2622	1.9369	80.19	3.5557	1.1865	7.47	7.6917
1.7	1641.0	1.2875	2.1186	83.65	3.1753	1.2078	7.04	8.1477
2.0	1653.9	1.3325	2.4553	84.30	2.8776	1.2467	6.55	8.9807

Fig. 2 Variation of isentropic compresiibility, β_s vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.

Fig. 3 Variation of intermolecular free length, L_f vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.

Fig. 4 Variation of acoustic impedance, Z vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.

Table 2 Thermodynamic and acoustic parameters of lanthanum(III) chloride in water and different proportions of sorbitol-water mixture at 303.15 K.

Solvent	ϕV^0 × 10^3 (dm^3 mol^−1)	Sv	−ϕK^0 × 10^9 (N^−1 dm^5 mol^−1)	Sk × 10^9 (N^−1 dm^13/2 mol^−3/2)	Sn^0	B (dm^3 mol^−1)
Water	41.85	38.28	12.39	6.23	14.22	0.5742
1.0% (w/V) sorbitol	45.28	35.22	10.29	4.38	12.00	0.5820
2.5% (w/V) sorbitol	46.45	32.27	9.06	4.20	11.36	0.6026
5.0% (w/V) sorbitol	47.30	29.77	8.57	3.89	11.07	0.6270
10.0% (w/V) sorbitol	48.42	26.08	7.20	3.04	9.77	0.6501

Fig. 5 Variation of molar volume, R vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.

Fig. 6 Variation of molar compressibility, W vs Conc. of lanthanum(III) chloride in water and sorbitol-water mixture at temperature 303.15 K.