🧪 pH Shelf Lab: Household Liquids, Dilution, Degree of Ionisation and Polyprotic Acid Species

Pick a bottle from the shelf (vinegar, lemon juice, cola, rain, baking soda, ammonia, bleach...) and read its pH from an exact charge-balance solver. Dilute it by a factor of a million, add acid or base, and watch H3O+, OH- and each protonation state of the acid appear as particles in the beaker, with species-distribution and buffer-test graphs.