#14 14. A solution of sodium oxalate, Na,C,O, is titrated with KMnO, and the red

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#14

14. A solution of sodium oxalate, Na,C,O, is titrated with KMnO, and the redox reaction shown be- low occurs. If0.2482 g of Na,C,O, is dissolved in water and titrated with 23.68 mL of KMnO, what is the molarity of the KMnO? Mn"(aq) + CO2(g) (not balanced; acidic conditions) MnO, (aq) + C,042-(aq) A 0.376-g sample of an iron ore is dissolved in acid to reduce the iron to Fe (ag). This acidic solution of Fe is then titrated with 41.25 mL of 0.02140 M KMnO. Determine the mass percent in the iron ore. The redox reaction for this titration is shown below Fe"(aq) + Mno, (aq) Fe"(aq) + Mn®(aq) (unbalanced; acidic conditions) xv Homework Sets

Explanation / Answer

Ans 14 :

The balanced reaction is given as :

2MnO42- + 5C2O42- + 16H+ = 10CO2 + 2Mn2+ + 8H2O

Number of moles of Na2C2O4 = C2O42- = 0.2482 / molar mass

= 0.2482 / 134

= 0.00185 moles

5 moles of oxalate requires 2 moles MnO4-

So 0.00185 moles of oxalate will require ( 0.00185 x 2) / 5

= 0.00074 moles of MnO4-

Molarity = no. of moles / volume of solution in L

So putting all the values we get :

= 0.00074 / 0.02368

= 0.03125 M

So the molarity of KMnO4 willbe 0.03125 M

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