how many milliliters of an 80% (v/v) solution of isopropyl alcohol would you need to make 40 mL of 20% (v/v) solution of isopropyl alcohol?
Love is the battery of life....
Take 10 mL of 80% and dillute it 4 folds (add 30 mL) to create 40 mL of 20%
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