Test for halides Flashcards
1
Q
What is a halide?
A
The name given to the ion formed by the halogens
2
Q
Method
A
- Add a few drops of nitric acid
- Add a few drops of silver nitrate
- Observe the colour of the precipitate
3
Q
Colour of Silver chloride (AgCl) precipitate
A
white
4
Q
Colour of Silver bromide (AgBr) precipitate
A
cream
5
Q
Colour of Silver Iodide (AgI) precipitate
A
yellow
6
Q
Why is nitric acid added before silver nitrate?
A
Nitric acid removes any carbonates eliminating the possibility of a false positive
7
Q
Why can hydrochloric acid not be used in place of nitric acid?
A
Hydrochloric acid contains chloride which is the substance you are testing for. The result would automatically be positive
