<p>Any ideas on how to memorize these (these are the ones I'm having trouble remembering)?:</p>
<p>Insoluble =
• All Carbonates (CO3-2) and Phosphates (PO4-3)
except Group 1 (IA) and Ammonium
• All Hydroxides (OH-1) except Group 1 (IA),Strontium, Barium, and
Ammonium
• All Sulfides (S-2) except Group 1 (IA),2 (IIA), and Ammonium
• All Oxides (O-2) except Group 1 (IA)</p>