Question

a conductivity cell is filled with 0.1m kcl. The resistance of the kcl solution is 200ohm. The same conductivity cell is filled with 0.03M NaCl and the cell resistance is 500 ohm. What is the conductivity and molar conductivity of 0.03M NaCl? The conductivity of 0.1m kcl solution is 1.29S /m.
Step by step solution ​

Answer 1

Answer:

For KCl solution:

κ=

R

b

Here κ is the conductivity, b is the cell constant and R is the resistance.

0.00189S/cm=

410.5ohm

b

Hence, the cell constant b is 0.776/cm

For CaCl

2

solution:

κ=

R

b

=

990ohm

0.776/cm

=0.000784S/cm

The molar concentration is C=

0.5L×111g/mol

11g

=0.198M

The molar conductivity of CaCl

2

solution is

C

1000 κ

=

0.198

1000×0.000784

=3.956Scm

2

/mol

Hence, the correct option is A