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For AP Chem you only need to know a small set of ions that are always soluble, listed below. All compounds that contain any ion, listed, are always soluble in water.
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Akali Metals
Group 1 on Periodic Table: Na+, K+, etc.
NO3-
Nitrates
NH4+
Ammonium
C2H3O2-
Acetates
NAAA
N: All Nitrates, A: Akali Metals, A: Acetates, A: Ammonium