Chapter 20, Problem 57A

Interpretation Introduction

Interpretation:

The reaction taking place at the cathode in the electrolysis of molten NaCl is to be written.

Concept introduction:

At the cathode reduction of positively charged ions(cations) takes place.

Answer to Problem 57A

Reaction at cathode:

$N{a}^{+}+e^{-}\to Na(s)$

Explanation of Solution

Since sodium ion is positively charged, it moves towards the cathode during electrolysis to get discharged and form sodium metal.

Conclusion

Reduction of sodium ion to sodium metal take place at the cathode.