Are neutral because the total positive charges of the cation equal the total negative charge of the anion.

Ionic compounds

Ionic Compounds• Are neutral because the total positive charges of

the cation equal the total negative charge of the anion.

Ionic Compounds• Are neutral because the total positive charges of

the cation equal the total negative charge of the anion.

• Cation is written and named first, anion is second.

Ionic Compounds• Are neutral because the total positive charges of

the cation equal the total negative charge of the anion.

• Cation is written and named first, anion is second.• Because the charges of each are ‘cancelled’ out –

the charges are not written.

Ionic Compounds• Are neutral because the total positive charges of

the cation equal the total negative charge of the anion.

• Cation is written and named first, anion is second.• Because the charges of each are ‘cancelled’ out –

the charges are not written. • EG. Lead Chloride = Pb2+ and Cl-.

Ionic Compounds• Are neutral because the total positive charges of

the cation equal the total negative charge of the anion.

• Cation is written and named first, anion is second.• Because the charges of each are ‘cancelled’ out –

the charges are not written. • EG. Lead Chloride = Pb2+ and Cl-

• Therefore lead chloride contains 2 chloride ions for every lead ion – Pb2+ Cl- Cl- = PbCl2

Writing formulae for ionic compounds• EG. Sodium Carbonate.

Writing formulae for ionic compounds• EG. Sodium Carbonate.• Na+ + CO3

2-

Writing formulae for ionic compounds• EG. Sodium Carbonate.• _______ + _________• From the charges on each side how many do we

need to make it balanced?

Writing formulae for ionic compounds• EG. Sodium Carbonate.• From the charges on each side how many do we

need to make it balanced?• Na+ Na+ and CO3

2-

Writing formulae for ionic compounds• EG. Sodium Carbonate.• From the charges on each side how many do we

need to make it balanced?• Na+ Na+ and CO3

2-

• Formula has cation first and anion second =

Writing formulae for ionic compounds• EG. Sodium Carbonate.• From the charges on each side how many do we

need to make it balanced?• Na+ Na+ and CO3

2-

• Formula has cation first and anion second = Na2CO3

Write formulas for these ionic compounds• Aluminium sulfate• Lead Nitrate

Aluminium Sulfate

• Al3+ and SO42-

Aluminium Sulfate

• Al3+ and SO42-

• We need to make it neutral, so…

Aluminium Sulfate

• Al3+ and SO42-

• We need to make it neutral, so…• Al3+ Al3+ and SO4

2- SO42- SO4

2-

Aluminium Sulfate

• Al3+ and SO42-

• We need to make it neutral, so…• Al3+ Al3+ and SO4

2- SO42- SO4

2-

• Formula is therefore Al2(SO4) 3

Lead Nitrate

• Contains Pb2+ and NO3-

Lead Nitrate

• Contains Pb2+ and NO3-

• We need to make it neutral = two nitrate ions for every lead ion

Lead Nitrate

• Contains Pb2+ and NO3-

• We need to make it neutral = two nitrate ions for every lead ion

• Pb(NO3) 2

Complete

Name of compound

Ions present Balance Formula

Sodium Chloride

Iron(III) Chloride

Aluminium Oxide

Write formula for these ionic compounds

a) copper (II) sulfateb) calcium chloridec) Lead oxided) Magnesium nitratee) Iron (II) oxidef) Potassium carbonateg) Aluminium nitrateh) Potassium Chloride