(i)
| Solution | pH | Type |
|---|---|---|
| B | 1 | (1) Strongly acidic |
| C | 13 | (2) Strongly alkaline |
| A | 4 | (3) Weakly acidic |
| D | 7 | (4) Neutral |
| E | 10 | (5) Weakly alkaline |
Increasing order of H⁺ ion concentration (lower pH → higher H⁺):
$$C < E < D < A < B$$
(pH 13 < 10 < 7 < 4 < 1)
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(ii)
(1) Acidic Salt:
Name: Sodium bisulphate (Sodium hydrogen sulphate)
Formula: NaHSO₄
Parent acid: Sulphuric acid (H₂SO₄) — strong acid, partially neutralised
Parent base: Sodium hydroxide (NaOH)
(2) Basic Salt:
Name: Basic copper chloride (Copper hydroxychloride)
Formula: Cu(OH)Cl
Parent acid: Hydrochloric acid (HCl)
Parent base: Copper hydroxide [Cu(OH)₂] — strong base, partially neutralised
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