Demonstrating oxygen evolution during photosynthesis using Cabomba

Demonstrating oxygen formation during photosynthesis can be a tricky process. One common way is to gather bubbles of gas given off by an aquatic plant. However, Elodea, which is often used to demonstrate this, can be very unreliable. 

This technical guide walks you through the process of using an alternative plant, Cabomba, which, when placed in a solution of sodium hydrogencarbonate in the presence of light of appropriate intensity, will photosynthesise and produce bubbles of oxygen-containing gas. These bubbles can be counted and the rate of bubbling can serve as an indication of the rate of photosynthesis.

The guide is fully illustrated with photographs demonstrating this reliable method. 

Download the instructions from the link on the right. (Large file due to illustrations)