Dissolution modeling and potentiometric measurements of the SrS–H2O–gas system at normal pressure and temperature at salt concentrations of 0.125–2.924 mM

The SrS–H2O–gas system was studied to determine the concentrations of formed particles at equilibrium state after the dissolution of strontium sulfide in distilled water at 25 °C. The solubility of SrS was experimentally measured at a salt concentration range of 0.125–2.924 mM, and the determined pH was at a range of 10.0–11.6. The concentrations of different sulfide forms were determined spectrometrically, potentiometrically and by iodometric titration. The solubility of SrS was evaluated to be 1.671 mM (200 mg/l) and the value of the calculated solubility product (Ksp) was 2.143×10−6 (mol/l)2 according to the measured pH value of 11.18 and the calculated concentration of formed particles at equilibrium state in a closed oxygen-free test system. The average measured gaseous hydrosulfide (H2S)g bonding rate by alkaline (0.5 M NaOH) solution was 0.827 u g/h cm2.