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Iron sulfide, FeS, is a sparingly soluble salt with a Ksp of 6.3 x 10^-18.
a) Write the chemical equation for the dissolution of iron sulfide.
b) Write the solubility product equation for the dissolution of iron sulfide.
c) Calculate the molar solubility of iron sulfide in pure water.
d) Calculate the molar solubility of iron sulfide in a solution that is saturated with hydrosulfuric acid, H2S ( [H2S] = 0.1 M) and has a pH of 2.0. Ka1 = 8.9 x 10^-8 and Ka2 = 1.2 x 10^-13.
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Estimate Delta G or this reaction at each of the following temperatures. (Assume that Delta H and Delta S do not change too much within the given temperature range.)
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