4:14 minutes
Problem 77a
Textbook Question

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 1NH422HPO4. No precipitate forms. Which of these metal cations are either possibly present or definitely absent: Al3 +, Na +, Ag +, Mg2 +?

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