Calculate the amount of 70% isopropanol needed to prepare 350 mL of 50% isopropanol, using 20% isopropanol as the diluent: ________.
Fill in the blank(s) with the appropriate word(s).
210 mL
Use the alligation method. A total of 30 parts of 70% isopropanol are needed, and 20 parts of 20% isopropanol are needed, for a total of 50 parts.
350 mL needed ÷ 50 parts = 7 mL per part
7 mL × 30 = 210 mL of 70% isopropanol are needed
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