The effect of temperature on reaction rate
                                              David A-Level 2
Background information
When sodium thiosulphate reacts with hydrochloric acid, a precipitate of sculpture forms. The time taken for a certain amount if sculpture to form is used to measure the reaction rate. The sodium thiosulpahte solution can be heated to different temperatures before hydrochloric acid id added, so the effect of increasing temperature can be measured.
The effect of temperature increase on this reaction can be predicted using the collision theory. This theory says that for a reaction to occur, particles must collide with a certain minimum energy called the activation energy, EA. When temperature is increased, particles have increased kinetic energy and move around faster. There is therefore an increase in the frequency of collisions.
Procedure:
1. Measure 10 cm*cm*cm of sodium thiosulphate solution and 40 cm*cm*cm of water into a conical flask.
2. Measure 5 cm*cm*cm of dilute hydrochloric acid in a 10 cm*cm*cm measuring cylinder
3. Warm the thiosulphate solution in the flask to the requires temperature
4. Put the conical flask over a piece of paper with a cross drawn on it.
5. Add the acid and start timing. Swirl the flask to mix the contents .Take the initial temperature of the mixture and record it in a table like the one below.
6. Repeat the experiment using different temperatures in the range 15℃ to 65℃.
Remember that one of your experiments can be carried out at room temperature and so will not require heating.
Initial temperature of the mixture in the flask/℃
Final temperature of the mixture in the flask/℃
Average temperature of the mixture in the flask/℃
Time taken for the cross to disappear
1/time taken
17.5
17.5
17.5
100.0
0.0100
25.0reaction rate
24.0
24.5
67.0
0.0149
Analysis:
The diagram increase higher because the temperature increases faster.
Conclusion
The reaction rate increases when the temperature increases.

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