Login/Sign Up
Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine?
Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine?
CBSE | Chemistry | Class 12 | Exercise 1 | General Principles and Processes of Isolation of Elements | NCERT Exemplar
Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine?

Reaction involved in the extraction of Cl2 from brine:

2Cl– (aq) + 2H2O(l) → 2OH– (aq) + H2(g) + Cl2(g)

Calculation:

ΔGᶱ = -nFE°

ΔGᶱ = +422kJmol-1.

E° = 422×103 / 2×96500

E° = – 2.2V

For the reaction to take place the

Thus, the external voltage must be greater than 2.2V for the given extraction reaction to occur.

i

More Material