Question

Which is not related to NaOH
1) Gossage process 2) Lowig’s process
3) Castner Kellner cell (Mercury cell) 4) Solvay process (Ammonia soda process)

Answer 1

Answer:

1) Gosssage process is the answer

Answer 2

Solvay process is used for the production of sodium carbonate, Na2CO3 (option 4).

• Gossage process is the way of producing sodium hydroxide through the reaction of calcium hydroxide with sodium carbonate.

$Na_{2} CO_{3}+$ $Ca(OH)_{2}$  →  $2NaOH$ + $CaCO_{3}$

• Lowig's process is used for the preparation of sodium hydroxide by reacting sodium carbonate with ferric oxide.

$Na_{2} CO_{3} +Fe_{2} O_{3}$  →  $2NaFeO_{2} +CO_{2}$

       And then further decomposing the product of the first reaction to get sodium hydroxide.

$2NaFeO_{3} + H_{2} O$  →  $2NaOH+Fe_{2} O_{3}$

• Castner Kellner process used to manufacture of sodium hydroxide by the electrolysis of brine solution.

At anode,

$2Cl^{-}$  →  $Cl_{2} + 2e^{-}$

At cathode,

$2Na^{+}+2e^{-}$  →  $2Na$ (amalgam)

Now the reaction between sodium hydroxide solution and mercury,

$2Na$  →  $2Na^{+} +2e^{-}$

At last the reaction of iron cathode of center cell,

$2H_{2} O+2e^{-}$  →  $2OH^{-} +H_{2}$

Here the concentration of NaOH increases and hence the NaOH is taken as the output product of the process.