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A base when dissolved in water yields a solution with a hydroxyl ion concentration of 0.05 mol litre⁻¹. The solution is:

1. basic
2. acidic
3. neutral
4. either 'b' or 'c'

Correct answer: basic

Solution

A hydroxyl ion concentration of 0.05 mol L⁻¹ indicates a basic solution because the concentration of OH⁻ is greater than that of H⁺ in neutral water (10⁻⁷ mol L⁻¹).

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