What is the percentage by volume of ethanol in the final solution when 85 ml of ethanol is diluted to a volume of 250 ml with water?
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If you pour 60 ml of ethanol in a volumetric flask, you add 340 ml of water to dilute this solution to a final volume of 400 ml. Volumetric flasks are designed to make or dilute solutions to specified final volume. Since you have 60 ml of ethanol in a total solution of 400 ml, the percentage of ethanol is 35 %.
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