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

• Published in: Journal of sulfur chemistry Vol. 32; no. 2; pp. 137 - 149
• Main Authors: Uiga, Kalev, Tenno, Toomas, Zekker, Ivar, Tenno, Taavo
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 01.04.2011; Taylor & Francis Ltd
• Subjects: equilibrium constants; hydrosulfide formation; solubility; SrS properties; strontium sulfide (SrS) dissociation
• ISSN: 1741-5993; 1741-6000
• DOI: 10.1080/17415993.2011.551937

The SrS-H 2 O-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 (K sp ) 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 (H 2 S) g bonding rate by alkaline (0.5 M NaOH) solution was 0.827  u g/h cm 2 .