1. Many fertilisers contain ammonium ions. Which formula correctly represents the ammonium ion?

a) NH₃⁺
b) NH₄⁺
c) NH₄^-
d) NH₃^-

2. One mole of sulfuric acid, H₂SO₄, is fully neutralised by ammonium hydroxide solution.

How many moles of ammonium hydroxide are needed to fully neutralise 1 mole of H₂SO₄?

a) 1 mole
b) 2 moles
c) 3 moles
d) 4 moles

3. One mole of phosphoric acid, H₃PO₄, is fully neutralised by ammonium hydroxide solution.

How many moles of ammonium hydroxide are needed to fully neutralise 1 mole of H₃PO₄?

moles

4. Which acid in the list below is monoprotic?

a) HCl
b) H₂SO₄
c) H₃PO₄
d) H₂CO₃

5. What name is given to an acid such as sulfuric acid, H₂SO₄, which has two acidic hydrogen ions?

6. Ammonium hydroxide reacts with nitric acid as shown:

NH₄OH(aq) + HNO₃(aq) → ? + H₂O(l)

Write the name of the salt formed.

7. When 2 moles of ammonium hydroxide react with 1 mole of sulfuric acid, the salt formed has the formula (NH₄)₂SO₄.

What is the name of this salt?

8. In the reaction between ammonium hydroxide and hydrochloric acid:

NH₄OH(aq) + HCl(aq) → NH₄Cl(aq) + H₂O(l)

Which pair of ions are spectator ions?

a) H⁺ and OH^-
b) NH₄⁺ and OH^-
c) NH₄⁺ and Cl^-
d) H⁺ and Cl^-

9. When ammonium hydroxide reacts with phosphoric acid, different salts can form depending on the mole ratio used.

What type of reaction is taking place when ammonium hydroxide reacts with phosphoric acid?

10. One mole of phosphoric acid reacts with 3 moles of ammonium hydroxide to form a fully neutralised salt.

Which formula represents the fully neutralised ammonium phosphate formed?

a) (NH₄)H₂PO₄
b) (NH₄)₂HPO₄
c) (NH₄)₃PO₄
d) NH₄PO₄