Drano is the commercial name for sodium hydroxide, a strong base. Sodium hydroxide should only be handled by adults trained in it use wearing gloves and eye protection. A teaspoon of solid sodium hydroxide dissolved in the cabbage juice produced a pH of 14, the highest possible pH. Note that in the picture, the stem of the glass the sodium hydroxide concentration so strong that it started to degrade the juice itself into a yellow substance. Sodium hydroxide is an example of a strong Arrhenius base that dissociates 100% in water. The single arrow in the equation mean the dissociation goes 100% into ions.