Why would it be unwise to simply add 10 drops of \(6 \mathrm{M}\) HCl
immediately in Step \(1 ?\) What could go wrong?
A solution may contain \(A g^{+}, P b^{2+},\) and/or \(H g_{2}^{2+} .\) A white
precipitate forms on addition of 6 M HCI. None of the precipitate dissolves in
hot water. The precipitate turns gray upon addition of ammonia. Which of the
Group I ions are present, which are absent, and which remain undetermined?
State your reasoning. Note: For "paper unknowns" such as this one,
confirmatory tests are usually not included, and you do not need to provide
any. The information provided here, without confirmatory tests, is sufficient
to clearly indicate the presence or absence of some of the Group I ions
studied in this experiment, while leaving others in doubt.
Present______
Absent______
In doubt______
