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Calculating pH and pOH

Learn how to calculate pH and pOH values using equations, understand the relationship between hydrogen and hydroxide ion concentrations, and grasp the pH scale. Discover the patterns and formulas involved in determining these crucial chemical properties.

sage-morris
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Calculating pH and pOH

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  1. Calculating pH and pOH

  2. pH pH: “potential of hydrogen” - A way of expressing the hydrogen ion concentration pH = - log [H+] [H+] = the hydrogen ion concentration

  3. Calculating pH Calculate the pH values using the equation pH = - log [H+]. Do you notice a pattern? 3.0 5.0 7.0 9.0 12.0

  4. How do we calculate [H+] if we know the pH? pH = - log [H+] [H+] = the hydrogen ion concentration [H+] = 10-pH

  5. Calculating [H+] Calculate the [H+] values using the equation [H+] = 10-pH. Do you notice a pattern? 1 x 10-3 M 1 x 10-5 M 1 x 10-7 M 1 x 10-9 M 1 x 10-12 M

  6. Calculating pH [H+] > 1 x 10-7 [H+] = 1 x 10-7 [H+] < 1 x 10-7

  7. The pH Scale - As pH increases, [H+] decreases - As pH decreases, [H+] increases

  8. pOH pOH: “potential of hydroxide” pOH = - log [OH-] Just like pH: - pOH is a convenient way of expressing the hydroxide ion concentration [OH-] = the hydroxide ion concentration Just like [H+]: [OH-] = 10-pOH pH + pOH = 14

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