Rules of thumb for H2O solubility

Question 1

1)A compound is usually soluble if it contains a group 1 cation. What are these?

Answer 1

1) Li+ (Lithium)
2) Na+ (Sodium)
3) K+ (Potassium)
4) Rb+ (Rubidium)
5) Cs+ (Celsium)
- also included
6) NH4+ (Ammonium)

Question 2

2) Usually soluble in water if it has a halide, What are these?
- what are the exceptions?

Answer 2

1) Cl- (Chlorine)
2) Br- (Bromine)
3) I- (Iodine)
4) F- (Fluorine)

• Exceptions
  1) Ag+ (Silver)
  2) Hg+2 (Mercury)
  3) Pb+2 (Lead)

Question 3

Usually always soluble?

Answer 3

1) NO3 -1 (Nitrates)
2) ClO4 -1 (Perchlorate)
3) CH3Co2 -1 (Acetates)

Question 4

These are usually Soluble? What are the exceptions?

Answer 4

SO4 -2 (Sulfates)

• Exceptions
  1) Ba +2
  2) Hg +2
  3) Pb +2