1. DILUTING A STOCK SOLN To make a soln less concentrated: add solvent
number of moles of solute doesn’t change
use formula M1V1 = M2V2

2. DILUTING THE STOCK SOLN
3.00 mL of the M stock solution is diluted to 25.0 mL. Calculate the new molarity.

3. PREPARATION OF THE DILUTION
Remove 3.00 mL of stock soln using a volumetric pipette.
Add it to 25 mL volumetric flask.
Dilute with water until the solution reaches the line.
Mix the solution.

4. PREPARATION OF THE DILUTION
How would you prepare 25 mL of 0.35 M NaHCO3 soln from a stock solution which is 0.97 M?

5. PREPARATION OF THE DILUTION
25.0 mL of a 1.55 M stock soln of NaOH is diluted by adding 31.0 mL of water. What is its new molarity?

6. MOLALITY (m) concentration units that do not contain volume
m = moles of solute
kg of solvent
kg of SOLVENT, not solution

7. MOLALITY (m)
What is the molality of a soln prepared by dissolving 32.0 g of CaCl2 in 217 g of water?