Question

To observe the effect of concentration on the conductivity electrolytes of different nature were taken in two vessels $A$ and $B. A$ contains weak electrolyte $NH _{4} OH$ and $B$ contains strong electrolyte $NaCl .$ In both containers, concentration of respective electrolyte was increased and conductivity observed.

• A. in A conductivity increases, in B conductivity decreases
• B. in A conductivity decreases, while in B conductivity increases
• C. in both A and B conductivity increase
• D. in both A and B conductivity decreases

Answer 1

Answer: (D)

Solution which contains large number of ions compared to another solution of same concentration at the same temperature has more conductance and is said to be stronger electrolyte. The one which has relatively small number of ions is called weak electrolyte. If concentration of respective electrolyte was increased, the equivalent conductance decreased in each case, but rapid decrease in equivalent conductance is seen in weak electrolyte.