Acid-base neutrality is expressed as which of the following? 1. pH = 14 2. pH < 7.0 3. pH = 7.0 4. [H+] > [OH–] 5. [H+] = [OH–]
a. 1 c. 2 and 4
b. 3 and 5 d. 1 and 4
ANS: B
In general chemistry textbooks, a pH of 7 represents universal neutrality, where the concentration of hydrogen ions (1 ? 10−7 mol/L) and hydroxyl ions (1 ? 10−7 mol/L) is equal. This is the pH of pure water.
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