The concentration of Pb in aqueous solutions saturated with PbS (galena) and H 2 S in the range 30 degrees to 90 degrees C. at atmospheric pressure was measured by the mixed-color dithizone method. Results indicate that PbS forms a complex PbS.nH 2 S in these solutions, and that n is probably close to 2. The values of Delta H degrees and Delta S degrees for the formation of the complex are calculated to be 13 Kcal/mole and 16 cals/deg mole respectively. These results are compared with published results of studies on other sulfides, and are found to agree well with those for Ag but not for Zn.

First Page Preview

First page PDF preview
You do not currently have access to this article.