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Dilution and Molarity Mr. Chapman Chemistry 30

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Page 1: Mr. Chapman Chemistry 30. A concentrated solution – contains a relatively large amount of solute A dilute solution – contains a relatively small amount

Dilution and MolarityMr. ChapmanChemistry 30

A concentrated solution – contains a relatively large amount of solute

A dilute solution – contains a relatively small amount of solute

Dilution – the process of decreasing the concentration of a solution by adding solvent.

Some Important Definitions...

Page 3: Mr. Chapman Chemistry 30. A concentrated solution – contains a relatively large amount of solute A dilute solution – contains a relatively small amount

Imagine this concentrated salt solution on the left... It’s concentration isC1 = n/V1

Suppose we diluted it by adding a bunch of water to it... It’s concentration is now C2 = n/V2

Concentration and Dilution

What should you notice that’s important here?

Page 4: Mr. Chapman Chemistry 30. A concentrated solution – contains a relatively large amount of solute A dilute solution – contains a relatively small amount

The Number of Moles in Each are EQUAL!!!

Number of moles in this one... Equals number of moles in this one...

Page 5: Mr. Chapman Chemistry 30. A concentrated solution – contains a relatively large amount of solute A dilute solution – contains a relatively small amount

From here we can derive the dilution equation:

Remember that n = moles!

n = C1V1 n = C2V2

C1V1 = C2V2The Dilution Equation

The Dilution Equation

V1 AND V2 NEED SAME UNITS!

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