Question

One beaker contains 100 mL of pure water and second beaker contains 100 mL of seawater. The two beakers are left side by side on a lab bench for one week. At the end of the week, the liquid in both beakers has decreased, however, the level has decreased more in one of the beakers than in the other. Explain why one of them has decreased more?

Answer 1

Explanation:

When we add a non-volatile solute in a solvent then due to the impurity added to the solution there will occur an increase in the boiling point of the solution.  

This increase in boiling point will be known as elevation in boiling point.

As one beaker contains seawater (water having NaCl) will have some impurity in it. So, more temperature is required by seawater to escape into the atmosphere.

Whereas another beaker has only pure water so it is able to easily escape into the atmosphere since, it contains no impurity.

Thus, we can conclude that level of pure water will decrease more due to non-volatile solute present in it as compared to seawater.