Polyatomic Ions

-ium is positive charges

-ate is negative charges

Solubility Rules

1. Group 1 metals, ammonium, and nitrate always form soluble compounds.

2. Assume all acetate compounds are soluble.

3. Pb, Ag, and Hg form insoluble salts.

4. F- salts are also insoluble.

5. Halogens form soluble salts (Cl, Br, I).

6. Hydroxide compounds are generally insoluble except for Sr, Ba, Ra.

7. The vast majority of all other salts are insoluble in water, so assume they are insoluble unless told otherwise.