The definition of pH is pH = -log[H3O+],where [H3O+] is the hydronium ion concentration.
If [H3O+] = 1.2 × 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
Correct Answer:
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