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A piece of iron limestone weighing 0.1965g was allowed to react with an excess of hydrochloric acid. The calcium in it was precipitated as calcium ethanedioate. The precipitate was dissolved in sulphuric acid, and the ethanedioate in the solution needed 35.6 cm^3 of a 0.0200 mol dm^-3 solution of potassium manganate (VII) for titration. Calculate the percentage of CaCO3 in the limestone.

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