# Boiling and Freezing Points of Solutions

• Qube
In summary, the aqueous solution with the lowest freezing point in the given group is 0.008m MgCl2. This is because it dissolves to form the most ions (Mg2+ and 2Cl-) compared to the other 0.01m solutions, which only dissolve to form one cation and one anion. This is due to the Van 't Hoff factor, which affects the freezing point depression of a solution.
Qube
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## Homework Statement

The aqueous solution with the lowest freezing point of the following group is:

1) 0.01m MgSO4
2) 0.01m NaCl
3) 0.01m CH3CH2OH
4) 0.008m MgCl2
5) all equal

## Homework Equations

Solutions have lower freezing points and higher boiling points than their solvents.

CH3CH2OH is a non-electrolyte. It will not dissolve.

## The Attempt at a Solution

I don't know exactly how to estimate the freezing point. I'm assuming it has something to do with the concentration of the ions. In that case it seems as if 0.008m of MgCl2 would dissolve into the most ions (Mg2+ and 2Cl-). Although it has a lower molarity, it dissolves to form one Mg2+ and 2Cl-, unlike all the other 0.01m solutions, which only dissolve to form one cation and one anion.

You are on the right track. Google for Van 't Hoff factor.

1 person

## What are boiling and freezing points?

Boiling point is the temperature at which a liquid changes into a gas and freezing point is the temperature at which a liquid changes into a solid.

## How do solutions affect boiling and freezing points?

Solutions have different boiling and freezing points compared to pure substances. The presence of solutes in a solution affects the intermolecular forces between the solvent molecules, causing a change in the boiling and freezing points.

## What is the difference between boiling point elevation and freezing point depression?

Boiling point elevation is the increase in boiling point of a solution compared to the boiling point of the pure solvent, while freezing point depression is the decrease in freezing point of a solution compared to the freezing point of the pure solvent.

## Why do some solutions have higher boiling points and lower freezing points than others?

The magnitude of boiling point elevation and freezing point depression depends on the concentration of solutes in a solution. Higher concentration of solutes leads to a greater difference between the boiling and freezing points compared to the pure solvent.

## How can the boiling and freezing points of solutions be calculated?

Boiling and freezing points of solutions can be calculated using colligative properties equations, which take into account the concentration of solutes and the characteristics of the solvent. These equations can be found in chemistry textbooks and online resources.

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