Stoichiometry problems

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3) how many mL of the 0.10M KMnO4 are needed to titrate 0.5g of Fe(NH4)2(SO4)2*6H2O

4) Using half reactions, write the balanced Net Ionic Equation for the following in a basicls solution:
KMnO4(aq) + Na2SO3(aq) + H2O(l) -> MnO2(s) + Na2SO4(aq) + KOH (aq)
Reduction: ??
Oxidation: ??

5) If 13.5 mL of a KMnO4 solution is titrated to the equivalence point with 8.75 mL of a 0.15M Na2SO3solution. What is the Molarity of the KMnO4 solution?

6) Why do we use an indicator in a titration and why is no indicator used in the titration of permanganate ion with iron (ii) ion?

7) During a titration, if the level of the solution in a 50 mL buret is above the first mark or below the last mark, why is it impossible to determine the precise reading?

8) To What place value should the volume in the 50 mL buret be recorded (included units)
 

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