Measuring rates of reaction

This is an experiment that you can do to measure the rate of reaction. As the two reactants start to react, gas is produced. When this happens the syringe will start to move back. This is when you have to start measuring the rate of reaction. Every 10 or 20s you should measure it until it stops. This will give you the volume of the gas. Once you have the information you should record it in a line graph like the one below. At the start the line should rise steeply, then it should curve more and more until it turns into a straight line. To calculate the rate of reaction you have to draw a line from 0 to the most outward point of the line, then carry on to the top of the graph. You then draw a straight line down to the x axis. From that point you  measure how many cm across and up it is and then put that number into a fraction. E.G 11/17 cm3/s. This is your rate of reaction.