Practical investigations
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I am carrying out a rate of reaction investigation between iodine and propanone, and was wondering if I'd be able to use titration as a method to investigate the effects of different acid catalysts.
Jenkin replies Yes, the reaction can be followed by a titration method. If you've got a copy, look in the Nuffield Chemistry Students’ Book, page 249 (experiment 11.2b, method 1).
Essentially, what you do is to mix together known volumes of solutions of iodine (in aqueous KI), propanone and chosen acid, and start your stopclock. The book tells you suitable concentrations and quantities of the solutions. At suitable time intervals you remove samples with a pipette and quench the reaction by running the samples into excess sodium hydrogencarbonate solution. You then titrate with standard sodium thiosulphate solution.
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: 22 January 2006
