34. A weighing of 0.150 g of limestone was dissolved in HCl, then Ca2 was precipitated in the form of oxalate, the washed precipitate was dissolved in dilute H2SO4 and titrated with 18.85 ml of KMnO4 solution with a CaCO3 titer of 0.00600 g/ml. Calculate the mass fraction of CaCO3 in limestone.

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