To investigate the effect of temperature on the rate of reaction.

Equipment

• Hydrochloric acid        
• Sodium Thiosulphate
• Conical Flask
• Hot water bath

What I will do

        Firstly I will pour 50cm  Sodium Thiosulphate into the large measuring cylinder then pour that into the conical flask. Then I will place the thermometer into the conical flask with the Sodium Thiosulphate. I will then place that into the heating bath. When the Sodium Thiosulphate is at the required temperature I will measure 5cm  of Hydrochloric acid in the small measuring cylinder and add it to the Sodium Thiosulphate. I will then place the mixture onto the ‘X’ Mat straight away. I will then start the stop clock. I will then wait until the mixture turns cloudy and I can no longer see the cross. Then I will stop the stop clock and record my results.

Fair Testing  

        I will make sure this is a fair test by choosing five evenly spaced temperatures to record my results. I will repeat this test three times. I will also make sure the amount of  Sodium Thiosulphate and Hydrochloric acid stays the same for all the experiments. I will also make sure as soon as the Hydrochloric acid has been added I will start the timer straight away. I will also make sure that I give each temperature the same amount of stirs.