Question

Balance the following reaction by the method of half reactions in acidic solution. SO42 + Br...

Balance the following reaction by the method of half reactions in acidic solution.

SO42 + Br - > Br2 +Se2

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Answer #1

SO42- + Br - --------------> Br2 +S02

Half reaction

oxidation state of S in SO42- is +6 and in product wich converted in to +4 i.e. reduction take place.

SO42- --------------> S02

in this two electrons are gained or removol of oxygen i.e reduction hence reaction iss

SO42- + 2e- --------------> S02 + 02 ----------------------1

half reaction

2Br - --------------> Br2 + 2e- -------------------2

from eq 1 and 2

SO42- + 2e- +2Br -  --------------> Br2 + 2e- +S02 + 02

SO42- + 2Br -  --------------> Br2 + S02 + 02

this is balanced equation

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