chemistry hw help

Question

Which of the following would have lower vapor pressure: a solution of water with 5 drops of food coloring or a solution of water with 2 drops of food coloring. Explain your answer.

Answer 1

The solution with 5 drops of food coloring would have a lower vapor pressure. Vapor pressure of a pure solvent is LOWERED by the addition of a solute. The more solute, the lower the vapor pressure. Read up on Dalton's law of partial pressures.