The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

Help me with this chemistry question urgent

The presence of some halide ions in solution can be detected using aqueous silver nitrate and aqueous ammonia.

Identify a halide ions which,on addition of aqueous silver nitrate, forms a precipitate that is insoluble in concentrated aqueous ammonia.


Identify a halide ions which cannot be detected using these reagents.
Reply 1
Avatar for England113
England113
OP
3
A mixture of two precipitates P and Q was formed by adding aqueous silver nitrate to a solution containing two different halide ions. Precipitate P dissolved on addition of an excess of dilute aqueous ammonia. The remaining precipitate, Q was filtered off.


Identify the halide ions in P


Precipitate Q was soluble in concentrated aqueous ammonia. Identify the halide ions in Q.
Original post by England113
A mixture of two precipitates P and Q was formed by adding aqueous silver nitrate to a solution containing two different halide ions. Precipitate P dissolved on addition of an excess of dilute aqueous ammonia. The remaining precipitate, Q was filtered off.


Identify the halide ions in P


Precipitate Q was soluble in concentrated aqueous ammonia. Identify the halide ions in Q.


You know that the precipitate is a silver halide. It is now a matter of finding the solubility of silver halides in ammonia solutions. You can easily look this up.
Reply 3
Avatar for England113
England113
OP
3
A mixture of two precipitates P and Q was formed by adding aqueous silver nitrate to a solution containing two different halide ions. Precipitate P dissolved on addition of an excess of dilute aqueous ammonia. The remaining precipitate, Q was filtered off.


Identify the halide ions in P


Precipitate Q was soluble in concentrated aqueous ammonia. Identify the halide ions in Q.
Reply 4
Avatar for k.lina
k.lina
Original post by England113
The presence of some halide ions in solution can be detected using aqueous silver nitrate and aqueous ammonia.

Identify a halide ions which,on addition of aqueous silver nitrate, forms a precipitate that is insoluble in concentrated aqueous ammonia.


Identify a halide ions which cannot be detected using these reagents.



Reactions with silver nitrate:
fluoride ion does not react
chloride ion forms white ppt
bromide ion forms cream ppt
iodide ion forms yellow ppt

When ammonia is added:
chloride (AgCl) ppt dissolves in dilute ammonia
bromide (AgBr) ppt dissolves in concentrated ammonia
iodide (AgI) ppt does not dissolve

Iodide ion forms a yellow ppt but it does not dissolve when concentrated ammonia is added.

Fluoride ions cannot be detected using these reagents because fluoride does not form ppt when silver nitrate is added.
Reply 5
Avatar for alow
alow
19
Original post by England113
A mixture of two precipitates P and Q was formed by adding aqueous silver nitrate to a solution containing two different halide ions. Precipitate P dissolved on addition of an excess of dilute aqueous ammonia. The remaining precipitate, Q was filtered off.


Identify the halide ions in P


Precipitate Q was soluble in concentrated aqueous ammonia. Identify the halide ions in Q.


Do some work yourself first. People won't do all of your work for you.
Reply 6
Avatar for England113
England113
OP
3
Original post by k.lina
Reactions with silver nitrate:
fluoride ion does not react
chloride ion forms white ppt
bromide ion forms cream ppt
iodide ion forms yellow ppt

When ammonia is added:
chloride (AgCl) ppt dissolves in dilute ammonia
bromide (AgBr) ppt dissolves in concentrated ammonia
iodide (AgI) ppt does not dissolve

Iodide ion forms a yellow ppt but it does not dissolve when concentrated ammonia is added.

Fluoride ions cannot be detected using these reagents because fluoride does not form ppt when silver nitrate is added.


Is the first bit silver iodide
Reply 7
Avatar for England113
England113
OP
3
Original post by alow
Do some work yourself first. People won't do all of your work for you.



Silver iodide. Then what's next

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you