Afra Al Kuwari
9D
Rates of Reaction Lab Report
Research Question:
How does the temperature of a solution affect the time it takes for different particles
to collide?
Aim:
I am going to investigate the relationship between the time of a rate of reaction and
the temperature of a solution by mixing different temperatures of Sodium
Thiosulfate in Hydrochloric acid and time them.
Hypothesis:
I think that the larger the temperature of "Sodium Thiosulphate" the faster the
reaction takes place. This is because when the mixture is heated, the molecules
move much faster. As a result the particles will collide more often and with an
increasing amount of energy.
Variables:
Independent Variables
Temperature of sodium
thiosulphate
Dependant variables
The time it takes for the
reaction to occur
Control
Amount of Hydrochloric
acid
Amount of sodium
thiosulphate
Total Amount of Solution
Fair Testing:
For the experiment and testing to be fair I will make sure that the amount of "HCL"
will always be 5ml, and the amount of "Sodium Thiosulphate" will be set at 50ml.
Also, I will make sure that I will not use the same measuring cylinders for "HCL" and
"Sodium Thiosulphate" will not get mixed up and they will both be different so the
purity of the solution will stay and they will not get mixed up. Another point is that
the "Blue" flame will be used throughout the whole experiment. All of these points
will allow my final results to be more reliable and accurate and decrease the amount
of errors, so this will lead the experiment to be more successful.
Afra Al Kuwari
9D
Materials:




Stopwatch (1)
Paper (for the ‘x’)
HCL (80ml)
Sodium thiosulphate (400ml)
Diagram:
Afra Al Kuwari
9D
Method:
1.
2.
3.
4.
5.
Gather all Materials
Draw an "x" in the middle of the paper
Turn the gas on and light the bunsen burner
Turn the flame on the bunsen burner to blue
Add 25 ml of "Sodium Thiosulphate" into the measuring cylinder and add it
to the conical flask
6. Put the conical flask in the ice
7. Make sure the solution is as close to 10'C as possible, by using the
thermometer
8. Place the conical flask on top of the "x", and make sure the "x" is at the center
of the flask
9. Add 5ml of HCL to the solution and time how long it takes for the "x" to
disappear
10. Keep it at room temperature
11. Repeat all the steps above 8 times but by adding 10 degrees each time but
without using ice
Results:
Data Table:
Temperature
(C).
0
10
20
30
40
50
60
70
Time:
Trial 1
2:06
48
20
13
10
4
3
Graph: (Attached)
Afra Al Kuwari
9D
Conclusion:
The larger the temperature of sodium thiosulphate then the faster the molecules
collide. When there’s a lot of heat, it gives energy, which makes the molecules
vibrate faster each time I increase the temperature. When the temperature was 10
degrees Celsius, it took 2 minutes and 6 seconds for the solution to get completely
cloudy. When the temperature was 70 degrees Celsius, it took only 3 seconds for the
solution to get cloudy. These results show that my hypothesis was correct.
Evaluation:
We controlled the variables by adding the correct amount of HCL and also to have a
balanced amount of sodium thiosulphate. To improve the lab,
we can have different concentrations and amounts of HCL and sodium thiosulphate.
The method was complicated when we did it because it took a lot of time to do. Also
because we didn’t gather all the materials we needed from the beginning of the lab.
To improve the method I would evenly distribute the ice in the beginning around
the conical
flask. I would also be more organized next time. The results on the graph are
accurate to the results on the data table. When it took only a couple of seconds for
the solution to get cloudy, the graph went down. The graph shows that the
hypothesis was right and also explains the hypothesis.