Calculate the millimoles of SeO32– in solution on the basis of following data:
70ml of M/60 solution of KBrO3 was added to SeO32– solution. The bromine evolved was removed by boiling and excess of KBrO3 was back titrated with 12.5 mL of M/25 solution of NaAsO2.
The reactions are given below.
I. SeO32– + BrO3– + H+ → SeO42– + Br2 + H2O
II. BrO3– + AsO2– + H2O → Br– + AsO43– + H+