A solution contains a mixture of cl- and br- ions. can both be positivevly identified?

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19-08-2022
Chemistry

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A solution contains a mixture of cl- and br- ions. can both be positivevly identified?

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tripatsingh039 tripatsingh039 · Answer 1 · 2022-08-25T01:43:33-04:00

Yes, [tex]Br^{-}[/tex] and [tex]Cl^{-}[/tex] ions both can be positively identified through precipitation reaction or precipitimetry.

Through titration employing precipitation reaction or precipitimetry, these two ions can both be positively identified. When exposed to Cl- and Br- ions, AgNO3 transforms into silver halides. AgNO3 with Cl- ions precipitates white because AgCl is not particularly soluble in water, whereas AgNO3 with Br- ions precipitates cream.

A very light cream precipitate results from mixing cream and white ppt.

Both halides react as described below:

[tex]AgNO_{3}+ XCl[/tex][tex]= AgCl_{whiteppt.}[/tex]

[tex]AgNO_{3}+ XBr[/tex] [tex]= AgBr_{creamppt.}[/tex]

Now, While AgBr does not dissolve in diluted ammonia, this AgCl precipitate does to create an Ag-diammonium ion combination. Two facts, including the fact that the ppt shade is now darker than the prior pale cream, demonstrate this. As a result of the addition of an ammonia solution, it becomes less concentrated, although some cream precipitates persist.

Second, concentrated ammonia dissolves the AgBr precipitate. AgBr precipitates dissolve when cream precipitate is filtered and concentrated ammonia is added. In solution Br- ions are confirmed by this.

[tex]Ag^{+}+NH_{3}[/tex] ⇄ [tex](AgNH_{3} )_{2} ^{+}[/tex]

The foregoing reaction switches in the right direction after the addition of diluted ammonia solution, and more and more Ag+ ions are complexed, producing the soluble form of Ag-diammonium complex.

Brown globules are produced when CHCl3 is added to the mixture and agitated.

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