We have to determine if any of the ions, Al3+, Na+, Ag+ or Mg2+, is either present or absent in the solution.
In qualitative analysis, we can separate metal ions through precipitation reactions.
Metal ions are classified into 5 groups based on their solubility and type of anion they form a precipitate with.
A solution containing several metal ions is treated with dilute HCl; no precipitate forms. The pH is adjusted to about 1, and H2S is bubbled through. Again, no precipitate forms. The pH of the solution is then adjusted to about 8. Again, H2S is bubbled through. This time a precipitate forms. The filtrate from this solution is treated with (NH4)2HPO4. No precipitate forms.
Which of these metal cations are either possibly present or definitely absent: Al3+, Na+, Ag+, Mg2+?
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