The lesser the pH value more acidic is the solution and the higher the pH value more alkaline is the solution. 1. Weakly alkaline: D (pH = 11) 2. Neutral: C (pH = 7)  3. Strongly acidic: A (pH = 1)  4. Strongly alkaline: E (pH = 13)  5. Weakly acidic: B (pH = 5)