A student has a sample of an unknown substance. In order to identify the cations presented he performs the following experiments:
When the sample is reacted with NaOH, a precipitate forms which is soluble in excess(of NaOH).
When the sample is reacted with NH3, a precipitate forms which is insoluble in excess.
When the sample is reacted with Cl- , a precipitate forms.
Which cation is present in the solution?
(A)Fe2+
(B)Fe3+
(C)Cu2+
(D)Al3+
(E)Pb2+
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4 comments:
is it E ?
I guess so because all the others are wrong, even if I didn't know so far that Pb does not form a complex with NH3.
You are right, E is the right answer.
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