Question: how to work out percentage volume?
Answer: A percent v/v solution is calculated by the following formula using the milliliter as the base measure of volume (v):
% v/v = mL of solute/100 mL of solution.
Example:
X % = 5.0 mL HCl/100 mL of solution.
X/100 = 5.0/100.
100X = 500.
X = 5.0% % v/v.