Hisbicus+Tea+Indicator

Acid-Base Indicator by Alvaro Campos Objective: create an Acid-Base indicator scenario, using hibiscus tea. The tea changes from red to green to indicate that a base has been added (ammonia). The reaction that takes place when the tea changes from green to red is   CO2 + H2O  H2CO3. The reason of this reaction is that w hen dry ice (solid carbon dioxide, CO2) is added, most of it produces carbon dioxide gas, giving the bubbles, but some of it reacts with water to form carbonic acid (H2CO3). The carbonic acid reacts with the base to neutralize it, bringing it back to the red color.