1. Making Dilutions M1 x V1 = M2 x V2
Making dilutions from known concentrations:
M1 x V1 = M2 x V2
Volume can be in liters or mL as long as the same units are used.

2. Dilution Problems
How would you prepare 1.00x102 mL of 0.40 M MgSO4 from a stock solution of 2.0 M MgSO4?
0.40 M x 100 mL= 2.0 M x V2
V2 = 20 mL
Answer - Take 20 mL of 2.0 M MgSO4 and dilute with enough water to make 100 mL of solution.

3. Dilution Problems Your Turn
How would you prepare 90.0 mL of 2.0 M H2SO4 from 18 M stock solution?
Answer
2.0 M x 90.0 mL = 18 M x V2
V2 = 10 ml or 1.0 x 101 mL
Take 10 ml of 18 M H2SO4 and dilute with water to 90 mL.

4. Dilution Problems Your Turn - 1 more
If 250 mL of a 12.0 M HNO3 is diluted to 1 L, what is the molarity of the final solution?
Answer -
250 mL x 12.0 M = 1000 mL x M2
M2 = 3 M HNO3