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The pH and pOH scales

The pH and pOH scales. pH scale. Measures the amount of H + in a solution. Scale used to measure whether a substance is an acid or a base. Lower numbers are acids. Higher numbers are bases. Examples. Which of the following pH values represents the strongest acid? A) 12.0 B) 9.0

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The pH and pOH scales

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  1. The pH and pOH scales

  2. pH scale • Measures the amount of H+ in a solution. • Scale used to measure whether a substance is an acid or a base. • Lower numbers are acids. • Higher numbers are bases

  3. Examples • Which of the following pH values represents the strongest acid? A) 12.0 B) 9.0 C) 2.0 D) 7.0 • Which of the following pH values represents the weakest base? A) 12.0 B) 9.0 C) 2.0 D) 7.0

  4. pOH scale • Measures the amount of OH- in a solution. • The pH and pOH scales are related by the following equation. pH + pOH = 14 • Ex: What is the pOH of a solution if its pH is 4? Is it an acid, base, or neutral? • Ex: What is the pH of a solution if the pOH is 9? Is it an acid, base, or neutral?

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