The pharmacy technician has been asked to prepare 450 mL of a 10% potassium chloride solution. On hand, the pharmacy has 5% and 20% potassium chloride solutions. She will need ________ of the 5% potassium chloride solution to prepare this order.
Fill in the blank(s) with the appropriate word(s).
300 mL
Use the alligation method. A total of 5 parts of the 20% solution is needed, and 10 parts of the 5% solution is needed, for a total of 15 parts.
450 mL needed ÷ 15 parts = 30 mL per part
30 mL × 5 parts = 150 mL of the 20% potassium chloride solution
30 mL × 10 parts = 300 mL of the 5% potassium chloride solution
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