**
- **Soluble:**
- All Group 1 (alkali metals) cations (Li$^+$, Na$^+$, K$^+$, Rb$^+$, Cs$^+$)
- All Group 2 (alkaline earth metals) cations except Be$^{2+}$ and Mg$^{2+}$ (Ca$^{2+}$, Sr$^{2+}$, Ba$^{2+}$)
- All ammonium (NH$_4$$^+$) salts
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