C15: Solubility Rules

Question 1

Mnemonic for solubility of salts and their exceptions (in brackets)

Answer 1

NAGSAG:

• N: Nitrates
• A: Acetates(also known as the ethanoate ion)
• G: Group 1
• S: Sulphates***(Calm Bad PMS)
• A: Ammonium ions
• G: Group 7(halogens)***(PMS)

Question 2

Sulphates are generally soluble with the exception of ________________

Answer 2

Calm Bad PMS

• P: Pb 2+
• M: Hg 2+
• S: Ag+
• Calcium
• Barium

Question 3

Halides are generally solube with the exception of the halides of:

Answer 3

PMS

• Pb: Lead
• Mercury: Hg
• Silver: Ag

Question 4

Insoluble salts

Answer 4

• Calm Bad PMS
• Carbonates(except Grp 1 and ammonium)
• Oxides(except Grp 1 and ammonium)
• Hydroxides(except Grp 1 and ammonium)