a) An alcohol solution was prepared by adding enough water to 35. 0 mL of the alcohol to make a total volume of 80.0 mL of the mixture. What is the % alcohol by volume?
A traditional way of determining the concentration of alcohol in alcoholic beverages is by measuring the
density of the solution, since these two characteristics of the solution (density and % alcohol) are
related. This is a convenient determination method because it is low cost and can be done quickly. This
is why customs officials sometimes use density measurements to classify alcoholic beverages and spirits.
In the stockroom, you will find a variety of reagents including two alcoholic beverages. Design and
perform an experiment to classify each of the two alcoholic beverages into one of the following five
categories of alcohol strength (based on % v/v) defined by the Canadian importation laws:
1. Less than 0.5% by volume
2. 0.5% - 1.2%
3. 1.2% - 7.0%
4. 7.0% - 22.9%
5. More than 22.9% by volume
Pre-Lab Questions
1. Perform the following calculations and report the answer to the appropriate number of significant
figures:
(a) An alcohol solution was prepared by adding enough water to 35. 0 mL of the alcohol to
make a total volume of 80.0 mL of the mixture. What is the % alcohol by volume?
(b) A 50.0 mL portion of 70.0% (by volume) alcohol solution was mixed with 50.0 mL of water.
What is the new % alcohol by volume?
(c) How many mL of a 70.0% (by volume) alcohol solution do you need to mix with enough
water to prepare 50.0 mL of a 1.2% alcohol solution?
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