Answer:
12.5 mL of acetic acid
Explanation:
The % by volume indicates the volume of solute in 100mL of solution.
It is a common type of concentration, as percent by mass or molarity.
Our solution is made of vinegar
Our solute is the acetic acid.
(Volume of solute / Volume of solution) . 100 = 5
(Volume of solute / 0.250L) . 100 = 5
(Volume of solute / 0.250L) = 0.05
Volume of solute = 0.05 . 0.250L → 0.0125 L
We convert the volume to mL→ 0.0125 L . 1000 mL /1L = 12.5 mL
We can also see this problem by a rule of three:
We convert the 0.250L to mL → 250 mL
And we propose, if 100 mL of vinegar have 5mL of acetic acid
250 mL may have (250 . 5) / 100 = 12.5mL
