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Colour change in redox titration of potassium dichromate and iron sulfate

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    I'm a little confused about the colour change in the redox titration of potassium dichromate and iron sulfate. I know that the dichromate ions are orange in the burette and turn green when they reach the conical flask as they are reduced. The addition of the sodium diphenylaminesulfonate indicator means that at the end point the colour in the flask is violet/blue so I'm not sure what to put when asked for the colour change in this reaction??? Some textbooks say colourless to purple but some other sources say green to purple?Does anybody know what AQA would mark as correct is this was an exam question? Thanks so much!!!
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Updated: April 27, 2016
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