We generally assume that the volume of a solution is equal to the volume of solv

Question

We generally assume that the volume of a solution is equal to the volume of solvent

a) This is based on the idea that solute-solvent interactions are approximately equal to the solven-solvent interations. Why does this assumption lead to a negligible volume change?

b) Is this always a valid assumption? If so why? If not, suggest that would have deviate from this assumption and state the direction of the deviation.

c) What do you expect to be true about the vapor pressure of solutions that have a volume that is smaller than the solvent volume?

Please explain?

Explanation / Answer

a)This is because each of the two takes place by the molecules of one occupying space in between the molecules of the other.Hence no volume change.

b)No,this is not always a valid assumption because the initial volume of a solute is negligible but that of a solvent is not. The deviation is that the increase in volume when two solvents are mixed is more compared to solute and solvent.

c)In such cases the vapour pressure is lowered as the surface volume of solvent in the solution also decreases.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.