Investigating Factors that Affect the Rate of a Reaction

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Investigating Factors that Affect the Rate of a Reaction



To investigate the rate of reaction when you combine the chemicals

sodium thiosulphate and hydrochloric acid at different temperatures.



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.



· Test tubes

· Thermometer

· Beakers

· Chronicle flask

· Measuring cylinders

· Tripods

· Heat proof mats

· Bunsen burner


To do this experiment I am going to-


· 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
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