Question

an aqueous solution of NaCl on electrolysis gives H2(g), Cl2(g) and NaOH according to the equation 2Cl- (aq) + 2H2O -----> 2OH- (aq) + H2 (g) + Cl2 (g) A direct current of 25 Ampere with a current efficiency of 62% is passed through 20 litres of NaCl (20% by weight) then, the time taken to produce 1 kg of Cl2 and the molarity of the solution wrt hydroxide ion is?

Answer 1

Answer:

Solution

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Correct option is A)

2NaCl⇌2Na

+

+2Cl

−

2H

2

O⇌2H

+

+2OH

−

At anode:

2Cl

−

→Cl

2

+2e

−

At cathode :

2H

+

+2e

−

→H

2

Net reaction (8 5 5:)

2NaCl+2H

2

O⇌2OH

−

+H

2

+Cl

2

+2Na

+

1000=

96500

35.5

×25.62×t

t=175374.83sec=48.74hr.

moles of OH

−

=

71

1000

×2

volume =20L

[OH

−

]=

71×20

2000

=1.408M