Chapter U4.16, Problem 2E

Interpretation Introduction

Interpretation:

The increase in the density of a solution due to increase in concentration needs to be explained.

Concept introduction:

Density of a solution is the amount of mass present per unit volume of the solution.

Concentration of a solution can be expressed in different units like molarity (M), normality (N), molality (m) etc. Molarity is the number of moles of solute present in 1 L solution.

Normality is the number of gram equivalent of solute present in 1 L of solution.

Molality is the number of moles of solute present in 1 kg solvent.

Answer to Problem 2E

When concentration increases then density increases as amount of solute present in definite volume of solution increases.

Explanation of Solution

Concentration of a solution can be increased either by increasing the amount of solute or by decreasing the volume of the solution.

When molarity, normality and molality increases for a solution then number of moles of solute per L solution increases. Thus, densirty increases.

Conclusion

Increasing concentration increases amount of solute in certain volume of solution. Thus, density increases.