A solution contains 2.5 cm3 of alcohol mixed with 75 cm3 of water. Calculate the concentration of this solution by volume
Question
Solution
The concentration of a solution is calculated by the volume of the solute (in this case, alcohol) divided by the total volume of the solution (alcohol + water), usually expressed as a percentage.
Step 1: Add the volume of alcohol and water to find the total volume of the solution. 2.5 cm3 (alcohol) + 75 cm3 (water) = 77.5 cm3 (total solution)
Step 2: Divide the volume of the alcohol by the total volume of the solution. 2.5 cm3 (alcohol) / 77.5 cm3 (total solution) = 0.032258
Step 3: Multiply by 100 to get the percentage. 0.032258 * 100 = 3.2258%
So, the concentration of the solution by volume is approximately 3.23%.
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