10. Consider the following unbalanced redox reaction: Cu 2 O(s) + Cr 3+ (aq) ???

Question

10. Consider the following unbalanced redox reaction:
Cu2O(s) + Cr3+ (aq) ????Cu2+(aq) + Cr (s)
(A) Below, balance the reaction in both acidic and basic aqueous solution:

(B) Identifywhichreactantis:
Oxidized: _________ The oxidant: ___________ Reduced: _________ The reductant: ___________

(C) Suppose the reaction above is at equilibrium; then, more Cr3+ is added to the solution. What is the effect on each of the following: ?Go, ?G, EO, E.

(D) For the reaction in acidic solution, determine ECELL if the system contains 0.5 moles Cu2O, 0.25 moles Cu2+, 0.15 moles Cr3+, 1.0 moles Cr(s), and pH = 6 in a 2 L solution.

Explanation / Answer

1)3 Cu2O(s) + Cr3+ (aq) +6H+----------->3Cu2+(aq) + Cr (s)+ 3H2O

2)

Oxidized: ___Cu____ The oxidant: _______Cr____ Reduced: __Cr_______ The reductant: ___Cu________

3)

decrease the values

4)

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