Investigating Factors that Affect the Rate of a Reaction
Aim
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To investigate the rate of reaction when you combine the chemicals
sodium thiosulphate and hydrochloric acid at different temperatures.
Prediction
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My hypothesis is that the higher the temperature the lower the amount
of time taken for the reaction to take place and therefore the lower
the temperature the longer the time will take for the reaction to take
place. The reason that I think this is because I know that the higher
the temperature the faster the particles will move. This is because
the particles have more energy. When the particles have more energy
there is more likelihood of a collision between particles, with enough
activation energy for a reaction to successfully take place.
Apparatus
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· Test tubes
· Thermometer
· Beakers
· Chronicle flask
· Measuring cylinders
· Tripods
· Heat proof mats
· Bunsen burner
Method
To do this experiment I am going to-
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· Set up the apparatus listed on the previous page
· I am then going to measure out the exact quantities of chemicals
(these are 10cm³ of sodium thiosulphate, 40³cm of water and 5 cm³ of
hydrochloric acid)
· The water and the sodium thiosulphate will be placed into the
chronicle flask and then heated to the correct temperature
· The warmed solution will then be placed on a piece of paper with an
" X " marked on it
· The hydrochloric acid will then be added and the stopwatch started
simultaneously started
· As soon as the " X " was completely was totally blocked out by the
change in colour by the reaction the stopwatch was stopped
· The result will then be recorded, the same process will be repeated
exactly to ensure the result I have found is accurate
· If the results are reliable and match one and other then I will