Question

Amongst the following, the form of water with lowest ionic conductance at $298\mathrm{K}$ is

• A. distill water
• B. sea water
• C. saline water used for intra venous injection
• D. water from a well

Answer 1

The correct option is A

distill water

The explanation for correct option:

(A) Distill water

Ionic conductance of distilling water is lowest because it does not contain any ions except ${\mathrm{H}}^{+}$ and ${\mathrm{OH}}^{-}$, which are available in minute concentration.

The explanation for incorrect options:

(B) seawater

Ionic conductance of seawater is very high due to the presence of a high amount of ions such as sodium and chloride ions in it, which are capable of carrying electricity through the water.

(C) saline water used for intravenous injection

1. Saline is a mixture of Sodium chloride and water and is used for treating dehydration.
2. This solution contains an ionic compound hence, the ionic conductivity of saline is high.

(D) Water from well

Ionic conductivity of well water is also high as it contains many ions like

Hence option A is correct, distill water has the lowest conductivity.