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Spontaneity of Reactions and Cell Potential

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Consider the reaction below at 25 C:

3SO4^2- (aq) + 12H^+ (aq) + 2Cr (s) --> 3SO2 (aq) + 2Cr^3+ (aq) + 6H2O

(a) Is the reaction spontaneous at standard conditions?
(b) Is the reaction spontaneous at a pH of 3.00 with all other ionic species at 0.100 M and gases at 1.00 atm?
(c) Is the reaction spontaneous at a pH of 8.00 with all other ionic species at 0.100 M and gases at 1.00 atm?
(d) At what pH is the reaction at equilibrium with all other ionic species at 0.100 M and gases at 1.00 atm?

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Solution Summary

This solution explains step-by-step how to determine the spontaneity of the reaction between sulfate ions and chromium based on standard cell potentials. The spontaneity is then examined using various pH's and concentrations.

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