The Definition of PH Is PH = -Log[H₃O⁺], Where [H₃O⁺]

question 78

Multiple Choice

The definition of pH is pH = -log[H₃O⁺], where [H₃O⁺] is the hydrogen ion concentration. If [H₃O⁺] = 1.2 x 10^-5, the pH, expressed to the correct number of significant figures, is:

• A) 4.92
• B) 4.9
• C) 5.08
• D) 5.1

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