The nurse needs to prepare 250 mL of 2/3 strength hydrogen peroxide. How many mL of sterile normal saline will the nurse use in this solution?
1. 62.5 mL
2. 75 mL
3. 125 mL
4. 250.5 mL
1
Rationale 1: The nurse should use the equation 250 mL (3/4 strength) = mL full strength hydrogen peroxide. When solving the equation, 250 x 3/4 = 187.50 mL of hydrogen peroxide. Then the nurse would subtract the total amount of hydrogen peroxide from the total amount of solution or 250 mL – 187.5 mL = 62.50 mL. The nurse would use 62.5 mL of sterile normal saline to make this solution.
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