Question

How is the presence of electrolytes tested in solution?

Answer 1

Hint : An electrolyte conducts electric current by dissociating into positively and negatively charged particles known as ions, which migrate toward and are normally discharged at the negative and positive terminals (cathode and anode) of an electric circuit.

Complete Step By Step Answer:
Start by boiling the solution in contrast to another solution containing a non-electrolyte solute. Whichever solution boils faster is the non-electrolyte substance, while the electrolyte dissolved solution takes the longer.
Any impurities dissolved in the solvent (in this case, water) tends to increase the boiling point temperature.
When a pure solvent is used, all of the surface molecules belong to the solvent; however, when an electrolyte solute (one that does not dissociate into its ions when added to a solvent) is combined with the solvent (water), the resulting solution contains surface molecules from both the solute and the solvent.
As a result, the rate of evaporation of the solvent decreases (because only solvent molecules were to evaporate in the first case, but by adding a non-volatile solute, which does not evaporate and thus occupies the spaces previously occupied by the solvent molecules, the evaporating molecules decrease), and the vapour pressure decreases as well.
To make the (present) solution's vapour pressure equal to the external atmospheric pressure, the (present) solution must be heated to a higher pressure than the pure solvent's boiling point. Since, $VP \propto \dfrac{1}{{BP}}$ , the boiling point of the solvent increases. [ $VP$ is vapour pressure and $BP$ is boiling point]
In other terms, adding a solute to a solvent effectively dilutes the mixed solution, meaning that space previously occupied by solvent molecules is now occupied by solute molecules, reducing the number of evaporating molecules that evaporate at any given time and requiring more energy (in the form of heat) to boil the solution

Note :
Electrolytes are mainly of two types: strong electrolytes and weak electrolytes.
There are three types of strong electrolytes: strong acids, strong bases, and salts. (Salts are often referred to as ionic compounds, but extremely strong bases are also ionic compounds)
Weak acids and bases are among the weak electrolytes.