1. Unit 8: Concentration and Molarity (M)
Objectives
What is concentration
How to calculate molarity
How to dilute a solution
Words to know
Solution Solute
Solvent Concentration
Molarity
Dilute
Dilution

2. Concentration
Concentration is a unit similar to density in the sense that it is a ratio
Concentration is the ratio of solute to solution.
For Kool-Aid this would mean the ratio between powder (solute) and
the water + powder (solution)
The unit of concentration that we will primarily be using is called Molarity (M)
This unit is given by Moles of Solute (Powder) / Liters of solution (Water + Powder)
Would a high concentration of Kool-Aid taste watery or sweet?

3. Dilution
Diluting or dilution is when you decrease the ratio of solute to solution
To dilute kool-aid would you … ?
Increase the amount of powder
Decrease the amount of powder
Increase the amount of water
D) Decrease the amount of water

4. Dilution formula
The formula for dilution is given by C1V1 = C2V2 or M1V1 = M2V2
C = concentration V = Volume M = Molarity
In this case our unit of concentration is M so C=M
Try this question…
Given 50 mL of a 2.0M calculate the new volume to make a solution of .5M?
How much water would you have to add for the above question?