Topic: Dilution
Do Now:
Dilution
Amount solute in concentrated
solution
EQUALS
Amount solute in dilute solution
Amount of solute is constant
Amount of solvent increases
original solution is
diluted
What can say about
number of solute
particles in a & c?
# is the same!
amount of solvent
has increased!
REMINDER: Molarity
Molarity = # of moles of solute
Liters of solution
MolarityC x VolumeC = MolarityD x VolumeD
MC x VC = MD x VD
(C = concentrated
D = dilute)
300ml of 2.5M NaOH is diluted to 750ml.
Find the molarity of the diluted solution
Example: We are doing a lab and the procedure
calls for 300ml 1.2 M NaOH. However, all we
have is a bottle of 5.5M NaOH.
We have to dilute it!!!!
The Equation: MC x VC = MD x VD
5.5 M x VC = 1.2 M x 0.3 L
V1 = (1.2 M x 0.3 L)
5.5 M
V1 = 0.065 L = 65 mL
So what does 65 ml tell us?!
To prepare the 1.2 M NaOH solution, you
pour 65 mL of 5.5 M NaOH into your
container and add water to get 300 mL final
volume (300-65 = 235 ml water added)
Dilution:
another
practice