Question

The resistance of a N/10 KCI solution is 245$\Omega$. Calculate the equivalent conductance of the solution if the electrodes in the cell are 4cm apart and each having an area of 7.0sq,cm.

• A. $23.32S{cm}^2{eq}^{-1}$
• B. $23.23S{cm}^2{eq}^{-1}$
• C. $2.332S{cm}^2{eq}^{-1}$
• D. none of these

Answer 1

The correct option is A $23.32S{cm}^2{eq}^{-1}$

Given resistance = 245$\Omega$

Formula for the specific conductance (K) = $\frac{1}{R}$ $\times \frac{l}{a}$

= $\frac{1}{245}$ $\times \frac{4}{7}$

K = 2.33 $\times {10}^{-}$${}^3$

Formula for the euivalent conductance= K $\times$ $\frac{1000}{C}$

= 2.33 $\times {10}^{-}$${}^3$ $\times 10000$

= 23.32S $c{m}^2$ eq ${}^{-}$${}^1$