Practical investigations
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I am carrying out an aspirin investigation where I am using colorimetry to analyse the purity of the aspirin. Initially I hydrolysed the aspirin, then neutralised it with the ethanoic acid. After this I have added iron(III) chloride. Why is it that initially the aspirin needs to by hydrolysed?
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Corrie writes .....
The reason is that aspirin itself does not form a coloured complex with Fe(III) ions, it is salicylic acid (2-hydroxybenzoic acid), one of the products of hydrolysis (when the hydrolysis mixture is acidified), that forms the coloured complex.
For more detail have a look at our Tutorial on Aspirin Investigations or our sorted past FAQs and answers on this topic. Both can be found via the Practical Investigations link on the Re:act Homepage.
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: 01 May 2008
