Solubility Rules for Ionic Compounds

Question 1

Group 1A Compounds (Li+,Na+,K+)

Answer 1

Always soluble (no exceptions)

Question 2

Ammonium Compounds (NH4+)

Answer 2

Always soluble (no exceptions)

Question 3

Acetates (C2H3O2-)

Answer 3

Always soluble (no exceptions)

Question 4

Nitrates (NO3-)

Answer 4

Always soluble (no exceptions)

Question 5

Group 17 Elements (Cl-,Br-,I-)

Answer 5

Soluble, with exceptions

Question 6

Exceptions to group 17 elements solubility

Answer 6

Any group 17 element with Ag, Pb, or Hg attached to it is NOT soluble.

Question 7

Sulfates (SO4-2)

Answer 7

Soluble, with exceptions

Question 8

Exceptions to sulfate solubility

Answer 8

Any sulfate with Ag, Pb, or Hg attached to it OR any sulfate with Ca, Ba, or Sr attached to it is NOT soluble.

Question 9

Carbonates (CO3-2)

Answer 9

Insoluble, with exceptions

Question 10

Exceptions to carbonate insolubility

Answer 10

Group 1A carbonates ARE soluble, and ammonium carbonate IS soluble ((NH4)2CO3)

Question 11

Phosphates (PO4-3)

Answer 11

Insoluble, with exceptions

Question 12

Exceptions to phosphate insolubility

Answer 12

Group 1A phosphates ARE soluble, and ammonium phosphate IS soluble ((NH4)3PO4)

Question 13

Sulfides (S2-)

Answer 13

Insoluble, with exceptions

Question 14

Exceptions to sulfide insolubility

Answer 14

Group 1A sulfides ARE soluble, and ammonium sulfide IS soluble ((NH4)2S)

Question 15

Hydroxides (OH-)

Answer 15

Insoluble, with exceptions

Question 16

Exceptions to hydroxide insolubility

Answer 16

Group 1A hydroxides ARE soluble, and Calcium Sulfide, Barium Sulfide, and Strontium Sulfide ARE soluble