An unknown sample is analyzed using the general qualitative analysis scheme shown in Figure 18.16. The sequence of reagents shown in the figure are used and a precipitate in only produced when (NH4)2HPO4 in NH3 is added. Which of the following describes a set of ions that might be present in the solution?
Ba2+ and Mg2+
Ba2+, Mg2+ and Na+
Ag+, Ba2+, Mg2+ and NH4+
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