1. Solutions
Molarity = concentration term used to describe an amount of solute dissolved in a given amount of solvent.
Concentrated solution = contains large quantities of solute dissolved in solvent
Dilute solution = contains small amounts of solute dissolved in solvent

2. Stock Solutions vs. Diluted Solutions
A stock solution tends to be a more concentrated solution that is kept and used to make more diluted solutions. A stock solution can be purchased or made by dissolving a solid solute into the solvent. You can always dilute a more concentrated solution. You CANNOT make a dilute solution more concentrated!

3. Preparation of Stock Solution
You need to prepare 100mL of a 0.125M CuSO4 stock solution. How would you make this solution?
Calculate the number of grams of CuSO4 needed.
In words, describe in a stepwise process how to make the solution. These must be specific to the particular solution you are making.

4. Preparation of Stock Solution
Weigh out 2.00 grams of copper(II) sulfate
Fill a 100. mL volumetric flask approximately ½ way with water.
Add in the solute (2.00 g)
Agitate until solute is completely dissolved.
Add water (solvent) until the solution reaches the line (score mark).

5. Diluting a Stock Solution
To make a solution LESS Concentrated:
Add solvent
Number of moles of solute does not change
Use formula: M1V1 = M2V2

6. Preparation of diluted solution
You would like to now make 25mL of M CuSO4 solution. How would you make this solution using the stock solution prepared?
Use this formula: M1V1 = M2V2 to calculate the volume of the stock solution you would need.

7. Dilution Mstock = 0.125 M Vstock = ?? Mdiluted = 0.0150M
Vdiluted = 25 mL
Vstock = 3 mL
How was the dilution prepared?

8. Preparation of diluted solution
Take 3.00 mL of the stock solution using a volumetric pipette.
Add to a 25 mL volumetric flask.
Dilute with water until the solution reaches the line.
Mix the solution.