Halogen reactions Flashcards
1
Q
what will Cl2 displace?
A
Br- and I-
2
Q
what will Br2 displace?
A
I- only
3
Q
what will I2 displace?
A
I2 will not displce any halide ions
4
Q
observation for mixing aqueous Cl2 and aqueous KBr
A
orange solution formed with solvent
5
Q
observation for mixing Cl2 and KI (both aqueous)
A
pink solution formed with solvent
6
Q
observation for mixing Br2 and KI (both aqueous)
A
pink solution formed with solvent
7
Q
testing for halides steps
A
-add dilute HNO3 to each test tube of unknown aqueous halide
-add aqueous silver nitrate (AgNO3)
F- gives no precipitate
Cl- gives white ppt
Br- gives cream ppt
I- gives yellow ppt
8
Q
if adding silver nitrate gives ppts which are hard to distinguish, what further steps and observations should be taken?
A
- add dilute ammonia to each test tube
- Cl- ppt dissolves in dilute ammonia
- Br- ppt dissolves in conc. ammoina
- I- is insoluble in dilute and conc. ammonia, so no change.
