Solubility Rules for Ionic Compounds in Water

Question 1

Generally Soluble with no exceptions

Answer 1

Li+, Na+, K+, NH4+, NO3-, C2H3O2-

Question 2

Generally Soluble: What are the exceptions for Cl-, Br-, and I-

Answer 2

When these ions pair with Ag+, Hg2 2+, or Pb2+, the resulting compounds are insoluble

Question 3

Generally Soluble: What are the exceptions for SO4 2-

Answer 3

When it pairs with Sr2+, Ba2+, Pb2+, Ag+, or Ca2+, the resulting compound is insoluble

Question 4

Generally Insoluble: What are the exceptions for OH-, and S2-

Answer 4

-When these ions pair with Li+, Na+, K+. or NH4+, the resulting compounds are soluble
- When S2-, pairs with Ca2+, Sr2+, or Ba2+, the resulting compound is soluble
- When OH- pairs with Ca2+, Sr2+, or Ba2+, the resulting compound is slightly soluble

Question 5

Generally Insoluble: What are the exceptions for CO3 2- and PO4 3-

Answer 5

When these ions pair with Li+, Na+, K+, or NH4+ the resulting compounds are soluble