MCQ : pH is defined as

Question

pH is defined as

1. [H₃O⁺]
2. log [H₃O⁺]
3. – log [H₃O⁺]
4. – [H₃O⁺]

Answer

-log[H₃O⁺]

Explanation

pH is defined as -log[H₃O⁺], where [H₃O⁺] is the concentration of hydronium ions in a solution. It is a measure of the acidity or basicity of a solution, with lower pH values indicating higher acidity and higher pH values indicating higher basicity.