Making Dilutions. Diluting a solution reduces the number of moles of solute per unit volume, but the total number of moles does not change. Higher molarity.

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Presentation transcript:

Making Dilutions

Diluting a solution reduces the number of moles of solute per unit volume, but the total number of moles does not change. Higher molarity = more concentrated

Put in order from most dilute to most concentrated 6.0 M 0.05 M M 5 x10 -3 M 3.5 M

ation/molarity

How can we change concentration? If we want to make 3.0 M hydrochloric acid, but we only have 6.0 M hydrochloric acid, what can we do?

Dilution Equation M 1 V 1 = M 2 V 2 Volumes can be in mL or L, but they must be the same on both sides. V is total volume of the solution, not the volume of water added!

Practice I have 20.0 mL of 2.00 M solution. I need to make M solution. To what volume should I add? M 1 V 1 = M 2 V 2 (2.00 M)(20.0) = (0.400 M)V 2 V 2 = 100. mL

I have 0.25 L of 3.0 M HBr. How much water should be added to produce a 2.0 M solution? M 1 V 1 = M 2 V 2 (3.0 M)(0.25 L) = (2.0 M)V 2 V 2 = L V is total volume. I already have 0.25 L of HBr, = So I should add 0.13 L of water