A-LevelChemistryAnalytical techniquesFeb/Mar 2017Paper 5 Q212 Marks
Transition metal complex ions are coloured. The formula of a complex ion can be determined using colorimetry. In colorimetry, light of a certain wavelength is passed through a complex ion solution. The absorbance of the light is proportional to the intensity of the colour of the solution. The more concentrated the complex ion solution, the more intense its colour and so the higher the absorbance. A student carried out an experiment to determine the formula of the complex ion formed between aqueous iron(III) ions, Fe3+(aq), and aqueous 2-hydroxybenzoate ions, C6H4(OH)CO2¯, which have the structure shown. [Figure: Structure of C6H4(OH)CO2¯]
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