The solubility product of solid phase in MSE and Pitzer model and the formation constant of NiCl+ and [NiCl2]0 species determined in this study.

The association constant of [HCl]0 aqueous species used in the calculation is also listed.Uncertainty limits are given in parentheses.* The solubility products were converted from mole fraction-scale in the literatures to molality-scale.£ Value was calculated by Pitzer−Simonson−Clegg (PSC) model [46].§ Values were calculated by HSC software (H = enthalpy, S = entropy, C = heat capacity) in literature [48].¶ The activity coefficient model assumed γion = γ±,ion.The solubility product of solid phase in MSE and Pitzer model and the formation constant of NiCl+ and [NiCl2]0 species determined in this study.