To understand the results from the demonstartion of the Rate of Reaction Application on Chemistry Disk1 you will need to look at the setup shown in the photograph. A light beam is shone through a beaker containing 50ml of sodium thiosulphate and 10 ml of hydrochloric acid is added. The light level is monitored with a light sensor connected to the ALBA Interface and Logger.
The software tools are used to find the gradient of the graph as this is the rate of the reaction.
Note that in the video clip below there is a slight delay while the acid is being added.