Question

60% solution of a alcohol has a volume of 70ml. What is the volume of pure alcohol in the solution

Answer 1

To solve, use formula, concentration of alcohol in volume percentage = $\frac{\text{Volume of alcohol}}{\text{Volume of solution}}\times 100$

Total volume of alcohol solution = 70ml
Concentration of alcohol solution in volume percentage = 60%
Substituting in the equation, 60 = $\frac{\text{volume of alcohol}}{70}\times 100$
Volume of pure alcohol = $\frac{60\times 70}{100}$ = 42ml