how to figure out the percent by volume?
['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.']