Chemistry 0620 · IGCSE · The characteristic properties of acids and bases

The characteristic properties of acids and bases — practice question

Nitric acid, HNO3, together with sulfuric acid, H2SO4, are strong acids, whereas ethanoic acid, CH3COOH, is a weak acid.
(a(i))[1]

State the formula of the common cation formed when each of the three acids dissociates in water.

(a(ii))[2]

Explain, in terms of dissociation, why nitric acid is described as a strong acid and ethanoic acid is described as a weak acid.

(a(iii))[1]

State which of the three dilute acids has the highest pH value.

(a(iv))[1]

State the colour of thymolphthalein in all three dilute acids.

(a(v))[2]

Give the formula of the anion formed when sulfuric acid dissociates in water; ethanoic acid dissociates in water.

(a(vi))[2]

Name the two gaseous products formed during the electrolysis of dilute sulfuric acid with inert electrodes.

(a(vii))[1]

Name the salt formed when calcium reacts with ethanoic acid.

(b(i))[1]

Define the term base.

(b(ii))[1]

State what this shows about the solubility of Al(OH)3.

(b(iii))[1]

Name one other compound which forms aluminium nitrate when added to dilute nitric acid.

(b(iv))[2]

Determine the oxidation number of the N atoms in Al(NO3)3. Show your working.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: hydrogen ion, H+

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