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8.4. The effect of temperature on the rate of reaction, p224.

S2O32-(aq)+2H+(aq)SO2(aq)+S(s)+H2O(l)

Apparatus:

400cm3 beaker full of water              A sheet of paper with white spot on it

2 boiling tubes                                   2 statives with clamping equipment

2 20cm3 labelled measuring cylinders 100cm3 of 0.50M HCl

100 cm3 0.10M sodium thiosulphate   2 200cm3 beakers

Thermometer           Timer               Bunsen burner               Labels(4)          Matches

Procedure:

1.     Put the tubes into the beaker so that they are half - immersed and connect the Bunsen burner.

2.     Put the paper with the dot behind beaker A.

3.     Add acid to B and thiosulphate to A (label cylinders and beakers).

4.     Wait a bit when the temperature of water = temperature of reactants.

5.     Add acid quickly to thiosulphate, start timer, stir with thermometer and record temp. =      

6.     Measure the time for the dark spot to disappear completely time =                      

7.     Repeat first 6 in different temperatures given below.

Temperature /C

Temperature/ K

1/T (x1000 K-1)

Time /s

1/t (rate) / x1000s-1

ln(rate)

(in the firs exp.)

+273

20

293

3.41

33.33

25

298

3.36

!Zero Divide

30

303

3.3

!Zero Divide

40

313

3.19

!Zero Divide

50

323

3.1

!Zero Divide

60

333

3

!Zero Divide

rate =. Activation energy is a tangent of 1/T against ln(rate).

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