# Topic: Dilution Do Now:

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Topic: Dilution Do Now:

Amount of solute is constant Amount of solvent increases
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

MC x VC = MD x VD MolarityC x VolumeC = MolarityD x VolumeD
(C = concentrated D = dilute)

300ml of 2. 5M NaOH is diluted to 750ml
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
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. Anytime you work with Molarity, if have to convert to L 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 = L = 65 mL So what does 65 ml tell us?!

To prepare the 1. 2 M NaOH solution, you pour 65 mL of 5
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 ( = 235 ml water added)

Dilution: another practice