To find out how quickly 25mls of Sodium Thiosulphate of different temperatures reacts with Hydrochloric acid to turn the solution cloudy.

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Alastair Drohan 2nd July 2001

Chemistry Course-work

Aim: To find out how quickly 25mls of Sodium Thiosulphate of different temperatures reacts with Hydrochloric acid to turn the solution cloudy.

Apparatus: Heated Water bath, to get the Sodium Thiosulphate to the required temperature, Sodium Thiosulphate, to mix with the Hydrochloric acid, Hydrochloric acid, to mix with the Sodium Thiosulphate, conical flask, to put the solution in whilst conducting the experiment, beakers, to mix the solution in, pipette, to transport the liquids with, bench mat, to protect the bench, laminated paper with a cross on, to tell when the experiment was done, and stop clock, to time how long the mixing process took.

Method: I took 25 ml Sodium Thiosulphate and heated it until it reached 70?. Whilst this was heating I set up the rest of my equipment as is shown. I placed my empty conical flask on top of the cross and added 5ml Hydrochloric acid to it. When the Sodium Thiosulphate had reached the correct temperature I added it to the acid and started the clock, I stopped the clock when looking from above I could not see the cross on the paper any more. I repeated each temperature 3 times and took an average for it in order to make it more of a fair test. I performed the experiment for 5 different temperatures, these were as follows: 70?, 60?, 50?, 40? and 30?.
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Alastair Drohan

Chemistry Course-work

Results:

Thiosulphate temperature.

st Time (s)

2nd Time (s)

3rd Time (s)

Average (s)

70?

5.18s

4.99s

5.79s

5.32s

60?

7.15s

7.52s

6.71s

7.13s

50?

8.57s

8.99s

9.48s

9.01s

40?

2.78s

1.95s

2.45s

2.39s

30?

6.08s

4.98s

5.44s

5.50s

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Alastair Drohan

Chemistry Course-work

Conclusion: As the results show the higher temperature Sodium Thiosulphate reacted quicker with ...

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