Question

Why does the Vapour Pressure of H2O (Water) decreases by the addition of solutes such as Sugar, Glucose, NaCl, Urea, etc. ?​

Answer 1

If you add a nonvolatile solute to solvent such as water, you decrease the tendency for water molecules to evaporate into the gas phase. ... As a result, fewer molecules change from the liquid to the gas phase, thus reducing the vapor pressure

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Answer 2

Answer:

Vapor pressure is a colligative property, so the vapor pressure of solutions is directly proportional to the amount of solute present in a solution. When a solute is present in a solvent, the vapor pressure is lowered because fewer solvent molecules are present at the top of the solution.

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