Rates of reaction - kinetics (A2)
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I am doing my coursework on the reaction between propanone and iodine. I've been told to investigate different concentrations but I don't know which reactants to change. From looking at other websites, it seems you have to change all of them. Don't know what to do! Thanks
Jenkin says
You haven’t said you are looking at the effect of changing concentrations on the rate of this reaction, but I am assuming that this is what you are doing.
The essential point is to change the concentration of only one reactant at a time, or you won’t know which reactant(s) have affected the rate. So, for example, you might carry out several experiments using different concentrations of iodine whilst keeping the propanone concentration constant. This should give you information on the effect of the concentration of iodine on the rate of the reaction.
You could then try varying the propanone concentration whilst keeping the iodine concentration constant. Since the reaction is always carried out in the presence of acid, you could do a third series of experiments varying the acid concentration.
The actual concentrations you use will depend on the method(s) you use to find the rate; you will need to research this and carry out trial experiments. There is a variety of resources available, both on the web and in textbooks.
The time available is likely to be a limiting factor.
Always carry out a risk assessment and check with your teacher before starting any practical work.
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 14 December 2006
