Question

To get a 12% V/V of alcohol solution, how much water (in mL) should be mixed with 12 mL of alcohol?

• A. 100 mL
• B. 88 mL
• C. 12 mL
• D. 50 mL

Answer 1

The correct option is B 88 mL

Given,
Volume of solute (alcohol) = 12 mL
Let the volume of water (solvent) required be x.
So the volume of solution = 12 + x
We know that,
Volume percentage of solution (V/V) $=\frac{\text{Volume of solute}}{\text{Volume of solution}}\times 100$

$\Rightarrow 12=\frac{\text{12}}{\text{12 + x}}\times 100$

⇒ 12 + x = 100
⇒ x = 100- 12 = 88 mL
Therefore, 88 mL of water should be mixed with 12 mL of alcohol to make a 12% V/V solution.