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)

Dilution: another practice