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Topic: What is substance A?  (Read 1460 times)

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Offline Iron Man

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What is substance A?
« on: October 10, 2013, 11:07:57 AM »

I`ve got some kind of quiz here, which my teacher has given to me:

There`s a substance A:
-with NaOH(aq)  there's a precipitate which can be solved in acids
-with BaCl2 there's a white precipitate which cannot be solved in acids
-in with NH3+H2O+H2S there will be some black solid
-with KSCN(aq) there wont be some colorful reaction

Out of reaction 2 I guess the Anion is the Sulfate-anion;
but I don't know what's the Kation.

Can somebody please help me?

Offline Borek

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Re: What is substance A?
« Reply #1 on: October 10, 2013, 12:53:27 PM »
Insoluble hydroxide, black sulfide, and definitely not the iron. See if anything mentioned here helps.
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