Identify Halides
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6 Terms
1
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Why does Halides need to be dissolved in water ?
To release ions , breaking the ionic bond
NaI ( s ) → Na+ ( aq ) + I - ( aq)
2
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Why add Nitric acid hNO3 acid to halides ?
To remove hydroxide ion or carbonate ion that might interfere with the test
3
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Why add sliver nitrate solution AgNO3
To form sliver halide precipitate
Ag+ ( aq ) + I - ( aq) → AgI ( g )
4
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What is the identification
White ppt : Cl-
Cream ppt : Br-
Yellow ppt : I-
5
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What can you do to make it easier to distinguish them ?
Divide sample into 2.
1 add dilute ammonia 1 add concentrated ammonia
6
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Identification
Cl- : dissolved in both
Br- : only dissolved in concentrated ammonia
I- : Insoluble
Note 
Flashcards (40)