How does vapour pressure chage when salt is add to water?
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When it is added to the solvent like water,lowering of vapour pressure of water takes place. Salt is electrolyte,hence it dissociates in water producing ions. Magnitude of any colligative property depends upon number of ions present in the solution. As vapour pressure decreases,boiling point of solution is elevated.
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Water boils when the molecules are able to overcome the vapor pressure of the surrounding air to move from the liquid phase to the gas phase. ... When you add salt to water, sodium chloride dissociates into sodium and chlorine ions. These charged particles alter the intermolecular forces between water molecules.
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