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A sample of hydrated ethanedioic acid H2C2O4.xH2O was dissolved in water and the solution made up to 250cm3

a 25.0cm3 sample of this solution was acidified and titrated with 0.100 mol dm-3 potassium manganate (VII) solution. 20.0cm3 of this potassium manganate(VII) solution was required to react fully with ethanedioate ions, C2O4 2-, present in the sample.

the MnO 4- ions in the potassium manganate (VII) oxidise the ethanedioate ions.

Complete and balance the ionic equation for the reaction between the manganate (VII) ions and the ethanedioate ions

2MnO 4- + 5C2O4 2- + ...... H + ----> ......(aq) + 10CO2 + ..... H2O
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