Answer to Question #285220 in Chemistry for michelle

Question

For the following galvanic cell: Ag(s) | Ag⁺(aq) || Mg²⁺(aq) | Mg(s), which electrode is the anode? 

1. Mg²⁺(aq)
2. Mg(s)
3. Ag⁺(aq)
4. Ag(s)

Answer 1

Solution:

1) Ag⁺(aq) + e⁻ → Ag(s), E^o = +0.80 V

2) Mg²⁺(aq) + 2e⁻ → Mg(s), E^o = −2.38 V

E^o_cathode > E^o_anode

+0.80 V > −2.38 V

Therefore, Magnesium electrode is the anode

Answer: 2. Mg(s)