Question

Write the formulae and names of compounds formed by combination of
(i) Fe3+ and SO4 2- ii) NH4+ and CO3 2-

Answer 1

Answer:

(i) Formula = Fe₂(SO₄)₃

   Name = Iron (III) Sulfate or ferric sulfate

(ii) Formula (NH₄)₂CO₃

    Name = Ammonium Carbonate

Explanation:

Data given:

(i) Fe³⁺ and SO₄²⁻

ii) NH₄⁺ and CO₃²⁻

Formula and named of the compound =?

Solution:

(i) compound from Fe³⁺ and SO₄²⁻ and its name

writing a formula in combined form

• The symbols of two ions written together that is FeSO₄
• The charges shown on each atom is its valency and it show its combining tendency so iron will combine with 3 sulfate ions and sulfate ion will combine with 2 iron ions
• When two ions combine their valencies should be write on the base of the alternate ions.

• that is 2 will be at the base of Fe and 3 will be at the base of SO₄ without charges
• So the combined formula and name will be

compound formula form from Fe³⁺ and SO₄²⁻ = Fe₂(SO₄)₃

Name of the compound = Iron (III) Sulfate or ferric sulfate

______

(ii) compound from NH₄⁺ and CO₃²⁻ and its name

writing a formula in combined form

• The symbols of two ions written together that is NH₄CO₃
• The charges shown on each atom is its valency and it show its combining tendency so NH₄⁺ will combine with 1 carbonate ion and carbonate ion will combine with two NH₄⁺ ions
• When two ions combine their valencies should be write on the base of the alternate ions 1 should not be written.

• 2 will be at the base of NH₄⁺ without charge

• So the combined formula and name will be

compound formula form from NH₄⁺ and  CO₃²⁻ = (NH₄)₂CO₃

Name of the compound = Ammonium Carbonate