This is probably a stupid question

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Chlo.Harr
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#1
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#1
When testing for ions, can you add other tests to other tests
E.g. I have to identify between sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride, can I do the;
Nitric acid test for carbonate ions
Then barium chloride test for sulfate ions
Then sodium hydroxide to test for ammonia

Can I add one test on top of another (have to do the experiment in as few tests as possible)

Thanks 😌
I have done the graft just stuck at the last hurdle!!!
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TheOtherSide.
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#2
Report 6 years ago
#2
(Original post by Chlo.Harr)
When testing for ions, can you add other tests to other tests
E.g. I have to identify between sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride, can I do the;
Nitric acid test for carbonate ions
Then barium chloride test for sulfate ions
Then sodium hydroxide to test for ammonia

Can I add one test on top of another (have to do the experiment in as few tests as possible)

Thanks 😌
I have done the graft just stuck at the last hurdle!!!
You can't, because every single time you add a chemical for each test, you've basically reacted the chemical with another one to make something else. So for example, if you added nitric acid to sodium carbonate, you'd end up with different products because the two have reacted. This product is no longer sodium carbonate, so any further chemicals you add to that chemical will be pointless.
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Chlo.Harr
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#3
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#3
But the ions still exist?
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TheOtherSide.
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#4
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#4
(Original post by Chlo.Harr)
But the ions still exist?
It's possible that one of the products formed will be a gas, in which case you'll have lost some of the original ions. It's probably more risk free just to do each test separately.
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Pigster
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#5
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#5
(Original post by Chlo.Harr)
When testing for ions, can you add other tests to other tests
E.g. I have to identify between sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride, can I do the;
Nitric acid test for carbonate ions
Then barium chloride test for sulfate ions
Then sodium hydroxide to test for ammonia

Can I add one test on top of another (have to do the experiment in as few tests as possible)

Thanks 😌
I have done the graft just stuck at the last hurdle!!!
IF nitric didn't make a gas, you know you haven't got a carbonate.
IF you then added Ba2+ and it didn't make a white ppt, you know you haven't got a sulfate.
IF you then added NaOH, wouldn't it just react with the nitric? IF you added an excess of OH-, it'd precipitate the Ba2+. IF you added enough OH-, it might allow you to test for NH4+.
Don't even think about adding Ag+ on top.

MUCH easier to use a new test tube.
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