AQA CHEM2 - Can't answer this question

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username1204031
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#1
Report Thread starter 7 years ago
#1
I can't answer this question in a CHEM2 paper:

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I've checked the mark scheme and it says you should add any soluble silver salt, but I have no idea why this is. I don't remember reading about this as a chemical test, is it something I should have been able to work out?
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charco
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#2
Report 7 years ago
#2
(Original post by JordanL_)
I can't answer this question in a CHEM2 paper:

Image
I've checked the mark scheme and it says you should add any soluble silver salt, but I have no idea why this is. I don't remember reading about this as a chemical test, is it something I should have been able to work out?
If you are trying to differentiate easily between acids then any compound that produces a precipitate with the HCl will do the trick, i.e. something with an insoluble chloride such as lead or silver. This works because all nitrates are soluble.
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HUBWD
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#3
Report 7 years ago
#3
Reagent you add AgNO3.


Observation with HCl = white precipitate that is soluble in dilute NH3.


Observation with HNO3 = Nothing/ no precipitate colourless solution.


You add AgNO3 because it reacts with the Cl in HCl to make AgCl which is a white precipitate that is soluble in dilute NH3
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