November 30, 2015

Homework Help: Chemistry

Posted by Vic on Monday, September 3, 2007 at 2:14am.

A colourless solution contains one type of ion. When one adds dilute HCl to it, a white precipitate initially forms. However, once more of the HCl solution is added, the precipitate dissolves. Explain why the ion is Pb2+ and not Al3+, Hg22+, Cu2+ nor Ag+.

I know Cu2+ is not an option because it forms a blue solution. Its not Al3+ or Hg22+ because a precipitate wouldn't form in the first place. But out of Ag+ and Pb2+, how do you tell which forms a complex ion and which doesn't?

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