SOLUBILITY RULES

Question 1

Which monatomic ions are ALWAYS soluble?

Answer 1

• All metal ions in first group (alkali metals)
• Li(+)
• Na(+)
• K(+)
• Rb(+)
• Cs(+)
• Fr(+)

Question 2

Which polyatomic ions are ALWAYS soluble?

Answer 2

• PANAC!! :)
• ClO4(-) (Perchlorate)
• NH4(+) (Ammonium)
• NO3(-) (Nitrate)
• C2H3O2(-) (Acetate)
• ClO3(-) (Chlorate)

Question 3

Which monatomic ions are GENERALLY soluble?
What are the exceptions?

Answer 3

• 3 SPECIAL HALOGENS
• Cl(-)
• Br(-)
• I(-)
• EXCEPTIONS: When bound with…
• Ag(+)
• Pb(2+)
• Hg2(2+)

Question 4

Which polyatomic ion is GENERALLY soluble?
What are the exceptions?

Answer 4

• SO4(2-)
• EXCEPTIONS: When bound with…
• Ca(2+)
• Sr(2+)
• Ba(2+)
• Pb(2+)
• Ag(+)
• Hg(2+)

Question 5

Which special ion is GENERALLY insoluble?
What are the exceptions?

Answer 5

• OH(-)
• EXCEPTIONS: When bound with…
• All metal ions in first group (alkali metals)
• Li(+)
• Na(+)
• K(+)
• Rb(+)
• Cs(+)
• Fr(+)
• NH4(+)
• Ca(2+)
• Sr(2+)
• Ba(2+)

Question 6

Which polyatomic ions are GENERALLY insoluble?
What are the exceptions?

Answer 6

• CO3(2-) (carbonates)
• PO4(3-) (phosphates)
• CrO4(2-) (chromates)
• S(2-) (sulfides)

EXCEPTIONS: When bound with…
* All metal ions in first group (alkali metals)
- Li(+)
- Na(+)
- K(+)
- Rb(+)
- Cs(+)
- Fr(+)

• NH4+ (ammonium)