Question

Discuss why the constituents of an aqueous solution can only be separated by evaporation and the concentration of the solute in the solution calculated in % (m/v) and in molarity

Answer 1

The answer to this question id quite simple

The aqueous solution of any substance has 2 components one is solute and another one is solvent

Example of this is a sugar solution in water

In such aqueous solution the mixtures become homogenous in nature and cannon be seperated by other techniques like sieving Or filtering etc

When we try to seperate the aqueous solution using evaporation method the solvent has a very low boiling point as compared to the solute and hence it can be evaporated easily leaving behind the solute and thus seperating the mixture into its components.

Now the concentration of this solutions is calculated in either% or in molarity because of the ease of doing it

It is not that this are the only methods of telling their concentrations other terms like normality molality can aslo be used to tell it's concentration

If the solute is present in very small quantity then concentration units like parts per million and parts per billion can also be used

I hope this helps. If you have any query or want more detailed explanation, feel free to ask in the comments section below.