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Topic: Dilution
Do Now:
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Amount of solute is constantAmount of solvent increases
Amount solute in concentrated solution
EQUALSAmount solute in dilute solution
Dilution
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original solution is diluted
What can say about number of solute particles in a & c?
# is the same!
amount of solvent has increased!
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REMINDER: Molarity
Molarity = # of moles of solute
Liters of solution
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MolarityC x VolumeC = MolarityD x VolumeD
MC x VC = MD x VD
(C = concentrated D = dilute)
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300ml of 2.5M NaOH is diluted to 750ml. Find the molarity of the diluted solution
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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
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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)