Respuesta :
Answer:
Other substances that give a positive test with AgNO3 are other chlorides present, iodides and bromide. However iodides and bromides have different colours hence they will not give a false positive test for KCl. Other chlorides present may lead to a false positive test for KCl.
Explanation:
In the qualitative determination of halogen ions, silver nitrate solution is used. Various halide ions give various colours of precipitate with silver nitrate. Chlorides yield a white precipitate, bromides yield a cream precipitate while iodides yield a yellow precipitate. All these ions or some of them may be present in the system.
However, if other chlorides are present, they will also yield a white precipitate just as KCl leading to a false positive test for KCl. Since other halogen ions yield precipitates of different colours, they don't lead to a false test for KCl. We can exclude other halides from the tendency to lead us to a false positive test for KCl but not other chlorides.
In the qualitative analysis test of chloride upon addition of AgNO₃, presence of diffrerent chloride salts other than KCl will gives false test.
How do we get on addition of KCl in AgNO₃?
On adding halogens on the silver nitrate solution we will get the precipitate of diffrent colors of diffrent halides.
- Chlorides will gives white color precipiate in the silver nitrate solution, so KCl and other chlorides will also give white color precipitate.
- Bromides will gives cream color precipitate.
- Iodides will gives yellow color precipitate.
So, presence of diffrent chloride salt in the silver nitrate solution in addition with KCl will gives a false positive result for the test.
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