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Calculating pH

Calculating pH. Big Range!. That’s Inconvenient! . Soren Sorensen (1909). pH = -log[H + ]. The pH Scale. Acids pH < 7. Bases pH > 7. Problem. Calculate the pH of a solution with [H + ] = 3.8 x 10 -3 M. What about [OH-]?. Same deal. pOH = -log[OH - ] Recall:

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Calculating pH

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  1. Calculating pH

  2. Big Range! That’s Inconvenient! Soren Sorensen (1909) • pH = -log[H+]

  3. The pH Scale Acids pH < 7 Bases pH > 7

  4. Problem • Calculate the pH of a solution with [H+] = 3.8 x 10-3 M

  5. What about [OH-]? • Same deal. pOH = -log[OH-] • Recall: Kw = [H3O+] [OH-] = 1.0 x 10-14M So… pH + pOH = 14

  6. Is there a way to calculate [OH-] or [H+] from pH or pOH? • Yup. • Remember antilogs? • pH = -log[H+] • pOH = -log[OH-] • 10-pH = [H+] • 10-pOH = [OH-]

  7. Application: • Doctors often have pH of patients urine tested during routine medical checks. If the pH is the normal range it can cause medical problems. If the pH of a urine sample was determined to be 5.53, calculate the pOH, [H3O+] and [OH-].

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