Dissolution and Solubility Product of Cd-Fluorapatite [Cd₅(PO₄)₃F] at pH of 2–9 and 25–45°C

Table 2

Thermodynamic data of Cd-FAP than Ca-FAP in the aqueous acidic media (an initial pH of 2).

FAP	Temperature (°C)	Average	(J/K·mol)	(J/mol)	(J/K·mol)	(J/K·mol)
Ca-FAP	25	−60.02	342473.29	−187235.69	−1777.55	4349.85
	35	−60.84	358789.08	−98779.03	−1485.61	4495.82
	45	−61.13	372185.51	−7403.00	−1193.67	4641.79
Cd-FAP	25	−60.03	342515.78	−85088.80	−1434.91	2339.50
	35	−60.38	356079.86	−37513.71	−1277.90	2418.01
	45	−60.45	368073.80	11631.51	−1120.89	2496.51