topic: dilution do now:. amount of solute is constant amount of solvent increases amount solute in...
TRANSCRIPT
Topic: Dilution
Do Now:
Amount of solute is constantAmount of solvent increases
Amount solute in concentrated solution
EQUALSAmount solute in dilute solution
Dilution
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
Anytime you
work with
Molarity, if
have to
convert to L
So what does 65 ml tell us?!
V1 = 0.065 L = 65 mL
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)