From a sample containing manganese sulfate, 1000 grams are taken and made up to 50 ml volume. Next, 25 ml of this solution is taken. Mn^+2 is titrated with 0.1M KMnO4. Consumption is 13ml. Another 1,000 gram portion taken is dissolved in some distilled water and precipitated with excess Ba2+ at pH:1. After the precipitate obtained is filtered and washed, the precipitate is boiled with 50mL of 0.125 M Na2EDTA solution and Ba2+ ions are taken into the solution as Ba(EDTA)2- complex. How many mL of 0.087M MgSO4 solution should be used for excess Na2EDTA?
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