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# Starting with Sodium Chloride How Would You Proceed to Prepare Sodium Hydroxide - CBSE (Science) Class 11 - Chemistry

ConceptGeneral Characteristics of the Compounds of the Alkali Metals

#### Question

Starting with sodium chloride how would you proceed to prepare sodium hydroxide

#### Solution 1

Sodium hydroxide can be prepared by the electrolysis of sodium chloride. This is called Castner–Kellner process. In this process, the brine solution is electrolysed using a carbon anode and a mercury cathode.

The sodium metal, which is discharged at a cathode, combines with mercury to form an amalgam.

Anode: Cl -> 1/2 Cl_2 + e^(-)

#### Solution 2

Sodium hydroxide is manufactured by electrolysis of an aqueous solution of NaCl (brine) in Castner-Kellner cell.

At cathode:
Na+ + e —–> Na
2Na + Hg ——->Na – Hg + 2H20
2Na- Hg + 2H20——>2NaOH +H2 +Hg

At anode:
Cl – e ——->Cl
Cl + Cl——–>Cl2

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 10: The s-Block Elements
Q: 16.2 | Page no. 306
Solution Starting with Sodium Chloride How Would You Proceed to Prepare Sodium Hydroxide Concept: General Characteristics of the Compounds of the Alkali Metals.
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