1. Molarity REview

2. Concentration
The concentration of a solution is a measure of the amount of solute in a given amount of solvent or solution.
Dilute: a relatively small amount of a solute in a solvent.
Concentrated: a relatively large amount of a solution in a solvent.

3. The number of moles of a solute in one liter of solution.
Molarity
The number of moles of a solute in one liter of solution.
For example: a 1 M solution of Sodium hydroxide contains one mole of NaOH for every 1 Liter of solution.
The unit for molarity is M

4. Molarity (M) = 𝑎𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 (𝑚𝑜𝑙) 𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝐿)
We can express molarity using the following equation:
Molarity (M) = 𝑎𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 (𝑚𝑜𝑙) 𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 (𝐿)
Don’t forget that if the units given aren’t in moles or Liters-we have to convert!
How do we convert?

5. Example
You have 350 mL of a solution that contains 1.54 mol of Sodium Chloride. What is the molarity of the solution?

6. Example
You have 6.2 L of a solution that contains 65 g of Ca(OH)2. What is the molarity of the solution?