Write net equation for the spontaneous redox reaction and determine the standard

Question

Write net equation for the spontaneous redox reaction and determine the standard cell potential that results when each of the following redox couples are connected in an electrochemical cell.

Instructions:

Couples Rxn: Ox(1) + Red(2) + other -> Red(1) + Ox(2) + other Eo (V) Cu/Cu2+ and Ag1+/Ag Pb2+/Pb and Fe3+/ Fe2+ H1+/H2 and Ni2+/Ni Cr/Cr3+ and Ag1+/Ag Write net equation for the spontaneous redox reaction and determine the standard cell potential that results when each of the following redox couples are connected in an electrochemical cell. Enter all substances in the order listed at the top of the column. Use a carot to indicate a superscript, but do nothing for subscripts. Use a hyphen + greater than (->) for yields. Click on the eye symbol to check your formatting.

Explanation / Answer

The standered reduction potentials of the given halfcells are a) Cu/Cu+2 = +0.34V Ag/Ag+ = + 0.80 V 2Ag+ + Cu ------------> Cu+2 + 2Ag E(cell) = 0.80 - 0.34 = 0.46V b) Pb/Pb+2 = -0.13V Fe3+/ Fe2 = +0.77V 3Pb+2 + 2Fe2+ ---------> 3Pb(s) + Fe+3 E(cell) = -0.13V - 0.77 V = 0.9V c) Ni/Ni+2 =-0.28V 2H+ + Ni ----------> Ni+2 +H2 E(cell) = -0.28V (d) Cr/Cr3+ =-0.74 V Ag/Ag+1 = +0.7996V 3Ag+ + Cr = 3Ag + Cr(3+) E(cell) = 0.7996 - (-0.74) = 1.539V

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