Chapter 16, Problem 56A

Interpretation Introduction

Interpretation: The reason is to be explained that molarity is more meaningful than knowing the concentration of a solution.

Introduction: Concentration and molarity are two important terminologies used in chemistry to express the quantitative measurement of a solution.

Answer to Problem 56A

Concentration usually measures the quantity of a solute (the substance present in a solution.) present per unit solution. There is mass, volume, and molar concentration. Molarity specifically measures the number of moles (the unit given to smaller substances like atoms and molecules) of solute in a solution per liter.

Explanation of Solution

It is better to know the molarity of the solution than the concentration because molarity gives a more detailed quantity of the solute present in a solvent than the concentration. For instance, a solution containing $0.50\text{moles}$ of $\text{KCL}$ in $750\text{L}$ is more detailed and helpful than a solution containing $50\text{g}$ of $\text{KCL}$ in $750\text{L}$ because molarity expresses the units in moles i.e., it gives the quantity of the smallest quantity like the number of atoms or molecules of solute present in a solvent.

Conclusion

Since the quantity of a solute is measured in the mole of solute per unit liter of solution, therefore, knowing molarity is more meaningful than knowing the concentration.