Question

A chemistry teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below :

What could be the probable thermometer reading recorded during the experiment?

• A. $0^{\circ }C$
• B. ${100}^{\circ }C$
• C. ${102}^{\circ }C$
• D. ${99}^{\circ }C$

Answer 1

The correct option is C

${102}^{\circ }C$

As impurities get added into the water the impurities get settled in the intermolecular spaces between the water molecules, thus increasing the force of attraction between the molecules present in the solution. Here as common salt is added it gets dissolved in water and the boiling point of water increases as a higher temperature is required to break the bonds between the molecules. Hence, adding impurities increases the boiling point of a liquid. Out of the given options, only ${102}^{\circ }C$ is above ${100}^{\circ }C$.