chemistry question help

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Hamza192786
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#1
Report Thread starter 7 years ago
#1
An excess of silver nitrate solution is addedto a solution of sodium chloride,and a whiteprecipitate is formed. The precipitate is then filtered off.

Which solution would not give a precipitate when added to the filtrate?

A Barium chloride
B Potassium nitrate
C Calcium iodide
D Sodium bromide

I know the answer but can someone explain it and how to get the answer thanks
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NineTailedFox
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#2
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#2
It is B I think,

When adding AgNO3 to XCl you get a white precipitate.
When adding to XBr you get a cream precipitate
When adding to XI you get a yellow precipitate.
B must be the answer by elimination.

You need to learn these colours for your exam and what happens to the precipitate when dilute/concentrated ammonia is added
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ALevelBro
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#3
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#3
So, the reaction is AgNO3 added to NaCl, which reacts, giving us a white precipitate (AgCl) and leaving us with the filtrate (NaNO3).

I'd agree it is B, seeing how adding KNO3 to NaNO3 shouldn't result in any reaction at all.
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Heffalump .
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#4
Report 7 years ago
#4
You need to know that from the halide test, ANY halogen that reacts with AgNO3 will make a precipitate, and as the only one on there that doesn't contain a halogen is B, then it must be B
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