Brief method to investigate decay

Add lipase solution to test tube Add milk to a different test tube Add phenolphthalein indicator to the milk Add sodium carbonate to the milk turning it alkaline Put both test tubes in a water bath until they reach 30 degrees Add a set volume of lipase solution into the milk solution and start the stopwatch The enzymes will start to decompose the milk beginning a colour change Once the solution has change colour stop the stopwatch and record the time of the colour change Repeat the experiment three times to ensure reliability Repeat the experiment at different temperatures and then calculate the rate of decay for each