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Water - Solubility - Ions

Extraction of Bromine from Sea Water.

Sea water contains bromide ions.
Chlorine is bubbled through sea water
to displace the less reactive bromine.

chlorine + sodium bromide     sodium chloride   +   bromine.
Cl_2(g)    +     2NaBr_(aq)                2NaCl_(aq)      +        Br_2(aq)

The ionic equation for the reaction is

Cl_2(g)   +    2Br^-_(aq)                 2Cl^-_(aq)    +    Br_2(aq)

The more reactive chlorine has taken an electron from
the bromide ion, forming a chloride ion and bromine.

The sea water is warmed and the bromine is collected as
a gas from the surface of the water and condensed.

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