Dissolution and Solubility of the (Ba_𝑥Sr_1−𝑥)HAsO₄·H₂O Solid Solution in Aqueous Solution at 25°C and pH 2

Table 2

Analytical data and solubility determination of the (Ba_𝑥Sr_1−𝑥)HAsO₄·H₂O solid solution.

Sample	Dissolution time (h)	pH	Concentration (mmol/L)			log𝐾sp	Average log𝐾sp	Δ𝐺^𝑜𝑓 (kJ/mol)
			Ba	Sr	As
SrHAsO4·H2O	2880	7.96	0.00	9.08	12.88	−4.62	−4.62	−1537.94
	3600	7.90	0.00	9.12	12.83	−4.62
	4320	7.95	0.00	9.16	12.53	−4.62
(Ba0.21Sr0.79)HAsO4·H2O	2880	7.77	0.91	13.34	15.38	−4.70	−4.69	−1538.54
	3600	7.77	0.98	13.32	15.54	−4.69
	4320	7.74	0.94	13.32	15.53	−4.69
(Ba0.42Sr0.58)HAsO4·H2O	2880	6.86	1.63	8.73	11.68	−5.11	−5.13	−1541.25
	3600	6.85	1.56	8.82	11.07	−5.13
	4320	6.83	1.54	8.69	10.81	−5.15
(Ba0.61Sr0.39)HAsO4·H2O	2880	6.18	3.92	5.18	10.15	−5.45	−5.49	−1543.50
	3600	6.10	3.91	5.17	10.17	−5.51
	4320	6.06	3.93	5.20	10.24	−5.53
(Ba0.82Sr0.18)HAsO4·H2O	2880	5.72	9.45	1.55	11.58	−5.57	−5.61	−1544.24
	3600	5.67	9.51	1.56	11.16	−5.63
	4320	5.68	9.57	1.57	11.07	−5.62
BaHAsO4·H2O	2880	5.61	10.53	0.00	11.42	−5.49	−5.52	−1543.99
	3600	5.56	10.56	0.00	11.25	−5.53
	4320	5.57	10.69	0.00	10.94	−5.53