The ph and poh scales
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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

The pH and pOH scales


Ph scale
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
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


Poh scale
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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