[ilovemath]

see attachment

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so I know the answer to the first part (hydrogen ions react with OH ions so eqm replaces Hydrogen ions)
BUT why can bromine be used in pools?

[ct2k7]

Bromine is a very reactive chemical, in fact, it is the most reactive after fluorine. It also destructs organic material (organisms) so it acts as a disinfectant. Goodbye algae and other crap.

Bromine readily dissolves in water, forming hypobromous acid, a weak acid. This dissociates into hydrogen and hypobromous ions.

[ilovemath]

(Original post by ct2k7)
Bromine is a very reactive chemical, in fact, it is the most reactive after fluorine. It also destructs organic material (organisms) so it acts as a disinfectant. Goodbye algae and other crap.

Bromine readily dissolves in water, forming hypobromous acid, a weak acid. This dissociates into hydrogen and hypobromous ions.

but the question says DESPITE it being toxic (incuding to humans)....why is it still used?

[ct2k7]

(Original post by ilovemath)
but the question says DESPITE it being toxic (incuding to humans)....why is it still used?

See the bit in my answer about bromine dissolving in water to form hypobromous acid. (OBr- + H+). It undergoes a disproprotionation reaction to form bromate and bromide salts.