Solved by a verified expert:. Experiment 1: What Household Substances are Acidic or Basic? Table 1: pH values of common household substances Substance pH Guess pH Paper Vinegar 5 2.2 Sodium bicarbonate (NaHCO3) 10 8.3 Lemon Juice 5 2.0 Green Tea 7 6.2 Milk 7 6.7 Sulphuric acid (H2SO4) 4 1 Questions Compare and contrast acids and bases in terms of their H+ ion and OH- ion concentrations