Effect of temperature on rate of reaction

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.