A solution is 0.0100 M in each of the metal ions in the following table: Metal sulfide KspaFeS 6Ã102NiS 8Ã10â1PbS 3Ã10â7CuS 6Ã10â16
a) HCl is added to the solution so that the H3O+ concentration is 0.300 M. H2S gas is bubbled through the solution to attain a H2S concentration of 0.100 M.
b) The solution remaining from Part A, which contains 0.0100 M Ni2+ and Fe2+ ions, is still saturated with H2S gas, producing a concentration of 0.100 M. A buffer is added to this solution to produce a pH of 2.01 . Which of the following describes correctly the effect of the addition of the buffer?a) Only NiS precipitates.b) Only FeS precipitates.c) Both NiS and FeS precipitate.d) Neither NiS nor FeS precipitate.
