practical investigation into reaction rates
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A practical investigation into Reaction Rate
Aim
The aim of this experiment is to derive a rate equation for the reaction between hydrogen peroxide and iodide ions, and to determine the order of reaction with respect to hydrogen peroxide.
Introduction
A rate reaction tells us the speed in which a reaction takes place. The rate is influenced by several factors including concentration and temperature.
The standard equation for rate is
Rate = K [x]n
In which n is the order of reaction (0,1, or 2) and K is the rate constant.
In this experiment the concentration of the hydrogen peroxide is the only variable that will alter the rate as temperature is held constant.
The peroxide reacts to form iodine and water, and the iodine reacts further with the thiosulphate and is removed, until thiosuphate runs out at which point the iodine reacts with the starch solution to make the colour change from clear colourless to blue black.
H2O2 + 2I- + 2H +  I2 + 2H2O
variable
2Na2S2O3(aq) + I2(aq) > 2I-(aq) + S4O62-(aq)
Requirements
4 Burettes and stands
5 conical flasks
test tubes and rack
measuring cylinder
Thiosulfate, 0.005 mol
Distilled water
H2SO4, 1 mol
KI,0.1 mol
H2O2, 0.2 mol
Starch solution
Stop clock
Procedure
1...