Question

108 g fairly conentrate solution of AgNO3 is electrolysed using 0.1 F of electricity. the weight of resulting solution is
a) 94g
b) 11.6g
C) 96.4g
4) none of these​

Answer 1

 

1 F electricity produce 1 mol Ag

0.1 F electricity produce 0.1 mol Ag

Weight of Ag produce =0.1×108=10.8

If electricity produced by consumption of 4 mol OH−

4F electricity evolves 1 mol of O2 ar the anode reaction, that is 32 g of oxygen gas.

0.1 F electricity produce = 0.1×(32/4)=0.8 g

0.1 mol Oxygen also get out of solution

so remaining solution =108−10.8−0.8

=96.4 g

Option C is correct

Answer 2

1 F electricity produce 1 mol Ag

0.1 F electricity produce 0.1 mol Ag

Weight of Ag produce = 0.1×108= 10.8

If electricity produced by consumption of 4 mol OH−

4F electricity evolves 1 mol of O2 ar the anode reaction, that is 32 g of oxygen gas.

0.1 F electricity produce = 0.1×(32/4)= 0.8 g

0.1 mol Oxygen also get out of solution

so remaining solution = 108−10.8−0.8  =96.4 g