Chem 126 Chem 126 Exam 3, 16 April 2018 19. A galvanic cell consists of one half

Question

Chem 126 Chem 126 Exam 3, 16 April 2018 19. A galvanic cell consists of one half-cell that contains Agls) contains Cu(s) and Cu?(aq). Which of the following sta conditions and Ag"tog), and one half-cell that statements is correct under standared Aglaq) +e Agls) E 240.80 v Cu2"(aq) + 2e-Cu(s) E" +0.34 V a. Aglag)/Agls) is anode and,E 0.46V b. Cu(aq)/Culs) is anode and, 0.46V d. Cu(aq)/Cu(s) is cathode and, E0.46 e. Ag'laq)/Agls) is anode and, E 1.1V Ag(aq)/Ag(s) is cathode and, 0.46V Ox i Poe (ell Caracola - Ano

Explanation / Answer

The one with the highest Eo value is better oxidizing agent (i.e it gets reduced) and acts as cathode(it accept the electrons and oxidation state reduces)
So from the above given information, Ag+ has the highest E0 and acts as cathode. and Cu2+(aq)/Cu(s) acts as anode.
Now at cathode:
Ag+ + e- --------> Ag     E0 = +0.80 V
At anode:
Cu -----> Cu2+ + 2e-    E0 = + 0.34 V

Eocell= E0Cathode - E0anode = +0.80V - (+0.34 V) = 0.46 V

Option b is the right answer

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