To find out how temperature will effect the rate of reaction between sodium thiosulphateand hydrochloric acid.

Safety Specs

Heat Mat

Measuring Cylinders

Sodium Thiosulphate

Hydrochloric Acid

Prediction: My prediction is that the higher the temperature the less time it will take to go a

cloudy colour because particles 2cxv5

Diagram:

Method: Collect all the apparatus and set them all up as it is shown in the diagram above. Light

the Bunsen burner and fill a beaker with 100ml of water, then measure 20ml in a

measuring cylinder and put into a conical flask. Put the conical flask in with the beaker.

Keep checking the temperature by using a thermometer. When it gets to the wanted

temperature, take the conical flask out and put it on the piece of paper with the cross on

it. Add 20ml of Hydrochloric acid then start the sop-clock. You then wait for the mixture

is the flask to go a cloudy colour. Once it has gone this colour stop the sop-clock and

take note of the time. Then do this for the rest of the temperatures. This will be made a

fair test by not stirring the acids and by doing the exact same procedure to the other

tests. Doing this will make it a fair test.

Results:

Temperature

Time

Taken

20°

31.16

30°

82.63

40°

31.02

50°

31.16

60°

24.55

70°

5.95