2014 4th Quarter : DILUTION WORKSHEET

Dilutions Worksheet - Solutions

1)        If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?

M₁V₁ = M₂V₂

(0.15 M)(125 mL) = x (150 mL)

x = 0.125 M

2)        If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?

M₁V₁ = M₂V₂

(0.15 M)(100 mL) = x (150 mL)

x = 0.100 M

3)        How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?

M₁V₁ = M₂V₂

(10 M)(250 mL) = (0.05 M) x

x = 50,000 mL

4)        I have 345 mL of a 1.5 M NaCl solution.  If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?

M₁V₁ = M₂V₂

(1.5 M)(345 mL) = x (250 mL)

x = 2.07 M

5)        How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution?

M₁V₁ = M₂V₂

(2.4 M)(500 mL) = (1.0 M) x

x = 1200 mL

            1200 mL will be the final volume of the solution.  However, since there’s already 500 mL of solution present, you only need to add 700 mL of water to get 1200 mL as your final volume.  The answer:  700 mL.