Question

What will be the concentration of NaCl solution, if the molar conductivity and conductivity of NaCl solution is 124.3 Ω^-1 cm² mol^-1 and 1.243 × 10^-4 Ω^-1 cm² respectively?

Options

• 0.01 mol L^-1

• 0.02 mol L^-1

• 0.1 mol L^-1

• 0.001 mol L^-1

Answer 1

0.001 mol L^-1 

Explanation:

∧ = 124.3 Ω^-1 cm² mol^-1 , k = 1.243 × 10^-4 Ω^-1 cm² , C = ?

∧ = `(1000 "k")/"C"`

∴ C = `(1000 "k")/∧`

∴ C = `(1000 xx 1.243 xx 10^-4)/124.3` = 0.001 mol L^-1