What is the standard voltage or cell potential of a Cr-Hg cell? (Remember to switch one-half...

What is the standard voltage or cell potential of a Cr-Hg cell? (Remember to switch one-half reaction to oxidation and to balance the number of electrons--use paper.)

Cr³⁺(aq)+ 3e^- → Cr(s) E^o = -0.74 V
Hg²⁺(aq)+ 2e^- → Hg(l) E^o = +0.789 V

Expert Solution

Cr³⁺(aq)+ 3e^- → Cr(s) E^o = -0.74 V
Hg²⁺(aq)+ 2e^- → Hg(l) E^o = +0.789 V

2Cr(s) --------------------> 2Cr^3+ + 6e^- E0 = 0.74v oxidation

3Hg^2+ + 6e^- -------> 3Hg(l) E0 = 0.789v reduction

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2Cr(s) + 3Hg^2+(aq) ------------> 2Cr^3+(aq) + Hg(l) E0 cell = 1.529v

queen_honey_blossom answered 2 years ago

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