Solubility of Ionic Compounds in Water

IonsBrCH3COO CNCO32−Cl FINO3 OHPO43−S2− SO42−
Ag+NSsNNNSNSNNSs
Al3+SN?SSsSSNNNS
Ba2+SSSNSSsSSSNSN
Be2+SN?SsSSSSNNNS
Ca2+SSSNSNSSSsNSsSs
Cd2+SSSsNSSSSNNNS
Co2+SSNNSSSSNNNS
Cr3+SNNSSsNSNNNS
Cs+SSSSSSSSSSSS
Cu2+SSNNSSSNNNS
Fe2+SSNNSSsSSNNNS
Fe3+SSNSNNS
Hg2+SsSSSNNNNNN
Hg22+NSsNNSsNNNN
K+SSSSSSSSSSSS
Li+SSSSSNSSSSsSS
Mg2+SSSSsSNSSNNNS
Mn2+SSNNSSSSNNNS
NH4+SSSSSSSSSNS
Na+SSSSSSSSSSSS
Ni2+SSNNSSSSNNNS
Pb2+SsSNNSsSsSsSNNNN
Rb+SSSSSSSSSSSS
Sn2+NNNSSsNNNNS
Sr2+SSSNSNSSSsNSN
Tl+SsSSSSsSNSSSsNSs
Zn2+SSNNSSsSSNNNS

S: soluble
Ss: Slightly soluble
N: Not soluble
− Does not exist
? No data.

Solubility General Rules

  • All Acetates (CH3COO-), Chlorate (ClO3-), Nitrates (NO3-) are soluble.
  • All common compounds of ammonium (NH4+), potassium (K+) and sodium (Na+) are soluble.
  • All chlorides (Cl-) are soluble except of silver (Ag+), mercury (Hg+), and lead (Pb2+).
  • All sulfates (SO4-) are soluble except lead (Pb2+), barium (Ba2+), strontium (Sr2+), calcium (Ca2+).
  • All carbonates (CO3-)are insoluble except ammonium (NH4+),sodium (Na+)and potassium (K+).
  • All hydroxides (OH-) are insoluble except ammonium (NH4+), sodium (Na+), potassium (K+), barium (Ba2+), strontium (Sr2+), calcium (Ca2+).

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