
Concept explainers
Interpretation:
Using the given statement, the weak and strong electrolyte substance is to be identified.
Concept Introduction:
The vapour pressure is the pressure of a vapour in equilibrium with its liquid phase at a given temperature in a closed system. Thus, there is equilibrium between the molecules at the surface of the liquid and with the gas phase molecules.
When a solute is added in the liquid, some of the solvent molecules at the surface are replaced by the solute molecules. As a result, the number of molecules in the gas phase is decreased leading to the decrease in vapour pressure.
Strong electrolytes are easily dissociated than weak electrolytes. Thus, strong electrolytes give a greater number of ions in solution which leads to the decrease in vapor pressure.

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Chapter 11 Solutions
Introduction to Chemistry
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