Effect of temperature on rate of reaction

Effect of temperature on rate of reaction

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Effect of temperature on rate of reaction

Aim:

To find out if the temperature increases the rate of reaction of two
chemicals.

Prediction:

My prediction is that the higher the temperature is the faster the
rate of the reaction will be.

Equipment:

Hot water, thermometer, flask, cold water, stopwatch, tissue paper,
paper with ‘X’ marked on it, safety glasses, measuring cylinder, large
beaker, sodium thiosulphate, hydrochloric acid.

Method:

The experiment has to be done five times for the five different
temperatures of the sodium thiosulphate. The temperatures are: 20°C,
30°C, 40°C, 50°C and 60°C

To start the experiments fill the flask with 50cm³ of sodium
thiosulphate into the large beaker. Fill the large beaker up with the
water of right temperature that is required for the experiment. Put
the thermometer into the flask with sodium thiosulphate and check the
temperature is right for the experiment. If the water is too cold, in
the large beaker pour in some more hot water or if it is too hot pour
in some cold water to reach the required temperature for the sodium
thiosulphate. Once the sodium thiosulphate is the right temperature,
take it out of the water, wipe the bottom of the flask with tissue
paper and place it onto the piece of paper with ‘X’ marked on it. Now
measure 5cm³ of hydrochloric acid in the measuring cylinder. Then pour
the hydrochloric acid into the sodium thiosulphate, at this moment
start timing with the stopwatch and keep timing until you cannot see
the ‘X’ mark through the liquid. Make sure you wear safety glasses and
handle the acid carefully.

Fair Test:

To make this investigation fair you have to make sure you use the same
concentration of hydrochloric acid for all experiments. You also have
to make sure you use the same amount of hydrochloric acid and sodium
thiosulphate for all the experiments. Also make sure you time the
experiments accurately.

Observation:

My observation was that when the temperature of the sodium
thiosulphate was higher the solution turned cloudy quicker.

Results:
--------------------------------------------
Temperature (°C) Time for cross to
disappear (minutes)

20 2.49
30 1.

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Related Searches

21
40 1.08
50 0.29
60 0.23
--------------------------------------------

Conclusion:

My conclusion is that the higher the temperature the quicker the
reaction is. My evidence is shown in the table above, because 60°C
takes less time than 20°C. My prediction was correct, because the
higher the temperature is the faster the rate of reaction would be. To
improve my experiment I would do the experiment 3 times for each
temperature and then use the average of the 3 results.
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