Example #3

Example #4

Exercise #1

Exercise #2

Exercise #3

EXAMPLE Dilution Problem:

What is the molarity of a nitric acid solution made by diluting 25.0 mL of a 15.8 M HNO₃ solution to 1.50 L?

Solution:

We recognize this as a dilution problem because it mentions two concentrations of the same substance and refers to the dilution of a more concentrated solution to form a more dilute solution. We can therefore use the dilution equation.

M_C = 15.8 M       V_C = 25.0 mL       M_D = ?       V_D = 1.50 L

M_CV_C = M_DV_D

     = 0.263 M HNO₃

Notice that a unit conversion is necessary to make our units cancel to yield a molarity unit.

Alternatively, we could work the problem using the dimensional analysis technique:

= 0.263 M HNO₃

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