http://www.ck12.org Chapter 16. Solutions
16.2 Solution Concentration
Lesson Objectives
- Use the terms concentrated and dilute to describe the relative concentration of a solution.
- Calculate the concentration of a solution as either a mass percent or a volume percent.
- Calculate the molarity of a solution. Use molarity to calculate the mass of solute needed to prepare a particular
solution. - Calculate the molarity of a diluted solution. Use the dilution equation to calculate the volume of a concentrated
stock solution required for a particular dilution. - Calculate the molality of a solution and distinguish molality from molarity.
Lesson Vocabulary
- concentrated
- concentration
- dilute
- molality
- molarity
Check Your Understanding
Recalling Prior Knowledge
- How is percent by mass of a compound calculated?
- How are grams of a substance converted to moles?
So far, you have studied how solutions can form and the limits to the amount of solute that can possibly dissolve in
a solvent at a given temperature and pressure. In this lesson, you will learn how to quantitatively express the amount
of solute present in any solution.
Percent Solutions
There are several ways to express the amount of solute present in a solution. Theconcentrationof a solution is a
measure of the amount of solute that has been dissolved in a given amount of solvent or solution. Aconcentrated
solution is one that has a relatively large amount of dissolved solute. Adilutesolution is one that has a relatively
small amount of dissolved solute. However, these terms are relative, and we need to be able to express concentration
in a more exact, quantitative manner. Still, concentrated and dilute are useful as terms to compare one solution to