For the extraction of sodium from NaCl,an ele | vedclass

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

Question

(D) In the electrolytic extraction of sodium (Downs process),the mixture of $NaCl$,$CaCl_2$,and $NaF$ (or $Na_3AlF_6$) is used to lower the melting po

Vedclass · Accepted Answer

The discharge potential of $Na^{+}$ is less than that of $K^{+}$ and $Ca^{2+}$ ions.

Vedclass · Answer

(D) In the electrolytic extraction of sodium (Downs process),the mixture of $NaCl$,$CaCl_2$,and $NaF$ (or $Na_3AlF_6$) is used to lower the melting point of $NaCl$.During electrolysis,the reduction potential of $Na^{+}$ is higher than that of $K^{+}$ and $Ca^{2+}$ (meaning $Na^{+}$ is easier to reduce than $K^{+}$ and $Ca^{2+}$).Since $K$ and $Ca$ are more reactive than $Na$,their ions have a higher discharge potential,meaning they remain in the molten state while $Na^{+}$ ions are reduced to metallic $Na$ at the cathode.

For the extraction of sodium from $NaCl$,an electrolytic mixture of $NaCl + Na_3AlF_6 + CaCl_2$ is used. During the extraction process,only sodium is deposited at the cathode,while $K$ and $Ca$ are not,because:

Similar Questions

Which of the following substances is an electrolyte?

What is produced by the dissociation of an electrolyte in an aqueous solution?

The product obtained at the anode on electrolysis of aqueous $H_2SO_4$ in the presence of $Pt$ electrodes is:

When $CuSO_4$ is electrolyzed using platinum electrodes,what happens?

During the electrolysis of molten sodium chloride,the electrode reactions are:

Vedclass Test Series

Exam Paper Generator

Online Exam Module