The active ingredient in household vinegar is acetic acid and is typically a 5.0 % acid solution (5.0 g acetic acid/100. mL vinegar). Use dimensional analysis to calculate the number of grams of vinegar needed if an experiment required 12.8 g of acetic acid. The density of vinegar is 1.02 g/mL (1.02 g vinegar/1.00 mL vinegar)