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Chemistry Titrations help please!!

Hey guys does anyone know how to work out the following question in the attached question paper below?

1b)


The mark scheme is attached- the only part I don't understand is how to work out the equation between the MnO4- and the Vanadate ions.

Basically I understand the first 3 marks given in the mark scheme but please can someone explain the rest of the answer?

Thanks everyone :smile:
(edited 5 years ago)
Reply 1
this is the question paper:
Reply 2
this is the mark scheme

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