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Bromate Reduction (with specific requirements)


battousai
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In a solution with both BrO3- and Br-, does anyone know how to reduce the BrO3- to Br- without oxidising the pre-existing Br- to Br2? Also, only potassium ions can be introduced into the solution.

 

My first thought is, to use hydrogen peroxide or potassium permanganate, but I believe this would oxidise the Br- to Br2.

 

Does anyone have any ideas?

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In a solution with both BrO3- and Br-, does anyone know how to reduce the BrO3- to Br- without oxidising the pre-existing Br- to Br2? Also, only potassium ions can be introduced into the solution.

 

My first thought is, to use hydrogen peroxide or potassium permanganate, but I believe this would oxidise the Br- to Br2.

 

Does anyone have any ideas?

 

"breakpoint bromination"... add a stoiciometric amount of ammonia.

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dlzc, could you explain [about breakpoint bromination] please?

 

Various oxidized halogens are added to waters containing ammonia, to neutralize the ammonia to nitrogen gas and water. The process is called breakpoint chlorination, bromination, or iodation (etc.). and they are added in precise amounts... resulting in a rapid conversion (high rate constant). These are discussed in literature, and well known in swimming pool chemistry (probably inclusive of salt water aquaria).

 

The same can be applied with ammonia added in suitable amounts to neutralize the "excess" oxidized halogens.:cool:

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