Q. 16 B4.4( 11 Votes )
Starting with sod
Sodium hydroxide is generally prepared commercially by the electrolysis of aqueous NaCl (brine) in Castner-Kellner cell by using mercury cathode and carbon anode.
⇒ Sodium metal which is discharged at the cathode combines with mercury to form sodium amalgam.
⇒ Cl2 gas is evolved at the anode.
At anode: 2Cl-→ Cl2 + 2e-
The sodium amalgam thus obtained is treated with water to form sodium hydroxide and hydrogen gas.
Note: Caster- Kellner cell is used in the manufacture of sodium hydroxide (NaOH). The working of Caster Kellner process is given below:
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