In the process of obtaining chlorine from bri | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The electrolysis of brine ($NaCl$ solution) involves the oxidation of chloride ions to chlorine gas at the anode: $2Cl^- (aq) \rightarrow Cl_2 (g)

Vedclass · Accepted Answer

$2.18$

Vedclass · Answer

(B) The electrolysis of brine ($NaCl$ solution) involves the oxidation of chloride ions to chlorine gas at the anode: $2Cl^- (aq) \rightarrow Cl_2 (g) + 2e^-$ $(E^\circ = -1.36 \ V)$.At the cathode,water is reduced: $2H_2O (l) + 2e^- \rightarrow H_2 (g) + 2OH^- (aq)$ $(E^\circ = -0.83 \ V)$.The overall cell reaction is $2Cl^- (aq) + 2H_2O (l) \rightarrow Cl_2 (g) + H_2 (g) + 2OH^- (aq)$.The standard cell potential is $E^\circ_{cell} = E^\circ_{cathode} - E^\circ_{anode} = -0.83 \ V - 1.36 \ V = -2.19 \ V$.Since the reaction is non-spontaneous,an external potential of at least $2.19 \ V$ (often approximated as $2.2 \ V$ or $2.18 \ V$ in textbooks) is required to drive the reaction.

In the process of obtaining chlorine from brine,the minimum value of $E_{cell}$ should be ....... $V$.

Similar Questions

Which of the following statements is correct regarding the cathode of an electrochemical cell?

Which of the following changes occurs during the discharging of a lead accumulator?

For the cell reaction,$Zn + Cu^{2+} \to Zn^{2+} + Cu,$ the cell representation is:

Compound $A$ used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound $A$ is

$A$ hypothetical electrochemical cell is shown below $A | A^{+} (xM) || B^{+} (yM) | B$. If the cell potential is $+0.20 \ V$,the cell reaction is :-

Vedclass Test Series

Exam Paper Generator

Online Exam Module