Question

Which of the following is a correct method to calculate the EMF of a galvanic cell?

(a) Standard EMF of the cell = [Standard reduction potential of the reduction half reaction] + [Standard reduction potential of the oxidation half reaction]

(b) Standard EMF of the cell = [Standard oxidation potential of the oxidation half reaction] – [Standard reduction potential of the reduction half reaction]

(c) E°cell = E°cathode – E°anode

(d) Standard EMF of the cell = [Standard reduction potential of the right hand side electrode] + [Standard reduction potential of the left hand side electrode]

I had been asked this question in homework.

Question is taken from Electrochemistry topic in division Electrochemistry of Chemistry – Class 12

Answer 1

Correct answer is (c) E°cell = E°cathode – E°anode

For explanation I would say: The correct methods to calculate the EMF of a galvanic cell are:

Standard EMF of the cell = [Standard reduction potential of the reduction half reaction] – [Standard reduction potential of the oxidation half reaction].

Standard EMF of the cell = [Standard oxidation potential of the oxidation half reaction] + [Standard reduction potential of the reduction half reaction].

E°cell = E°cathode – E°anode.

Standard EMF of the cell = [Standard reduction potential of the right hand side electrode] – [Standard reduction potential of the left hand side electrode].