Officers Candidate School Redox

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Teleologist

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Consider the oxidation of OCS by bromine to sulfate ion and carbonate ion in strong basic solution. What is the ratio of hydroxide ion to product bromide ion?

1) 2:1
2) 1:1
3) 3:2
4) 8:1

How would you do this?

This is what I had in mind:

OCS - oxidized.
Br2 - oxidizing agent (reduced).
We have both reduction and oxidation in one reaction so no electrons needed - i.e. this aint no half reaction.

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