Based on your observations in Experiment 7 predict the results of treating water

Question

Based on your observations in Experiment 7 predict the results of treating water suspensions of CuCO_3, ZnCO_3, and Ag_2CO_3 with H_2S. Explain your predictions. Which contains a higher [HS^-], a saturated solution of CuS or a saturated solution of ZnS? How can you tell based on your experimental results? Which aqueous solution contains the greater [HS^-], a solution saturated with CuS or 1 M H_2SO_4 saturated with H_2S (saturated H_2S solution is approximately 0.1 M H_2S)? Defend your answer based on your results from this Experiment. Consider the following equilibria: CuS + 7 H_2O doubleheadarrow Cu(H_2O)_6^2 + + HS^- + OH^- H_2S + H_2O doubleheadarrow H_3O^+ + HS^- and realize that Cus is not soluble in 1 M H_2SO_4.

Explanation / Answer

4)

CuCO3 (aq) + H2S (g) -------> CuS (s) + H2O (l) + CO2 (g)

ZnCO3 (aq) + H2S (g) -------> ZnS (s) + H2O (l) + CO2 (g)

Ag2CO3 (aq) + H2S (g) -------> Ag2S (s) + H2O (l) + CO2 (g

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