10⁻² M HCl is a strong acid (pH=2). 10⁻² M NaOH is a strong base (pOH=2, so pH=12). MgSO₄ is neutral (pH≈7). CH₃COOH is a weak acid (pH>2). The strong base NaOH has the highest pH. [cite: 477, 479, 480, 483, 486, 487, 488, 489, 490]