Prescription is for 300mL of a 5% hydrogen peroxide solution with water.. On hand you have 20% hydrogen peroxide solution. How much 20% hydrogen peroxide would be required to prepare this solution
300 mL x 0.05 = 15 mL hydrogen peroxide.
0.2x = 15 --> x = 15/0.2 = 75 mL of 20% hydrogen peroxide
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