John shows the acid/base chemical reaction that occurs between to water molecules. Because was is such a weak acid and weak base, the amount of product formed from this reaction is relatively small, yet it is very significant. Duration: 5:55.
Pigments in red cabbage are natural pH indicators. Kai and Maile explain how to make and use red cabbage stock to test the pH of common household products. Note: the bleach turns the pigment yellowish because it oxidizes the pigment not because of the high pH. Duration: 3:24.