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II. pH

Acids & Bases. II. pH. pouvoir hydrogène (Fr.) “hydrogen power”. B. pH Scale. 14. 0. 7. INCREASING BASICITY. INCREASING ACIDITY. NEUTRAL. pH = -log[H 3 O + ]. B. pH Scale. pH of Common Substances. B. pH Scale. pH = -log[H 3 O + ] pOH = -log[OH - ] pH + pOH = 14

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II. pH

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  1. Acids & Bases II. pH

  2. pouvoir hydrogène (Fr.) “hydrogen power” B. pH Scale 14 0 7 INCREASING BASICITY INCREASING ACIDITY NEUTRAL pH = -log[H3O+]

  3. B. pH Scale pH of Common Substances

  4. B. pH Scale pH = -log[H3O+] pOH = -log[OH-] pH + pOH = 14 [H3O+]= Inverse log (-pH) [OH -] = Inverse log (-pOH)

  5. B. pH Scale • What is the pH of 0.050 M HNO3? pH = -log[H3O+] pH = -log[0.050] pH = 1.3 Acidic or basic? Acidic

  6. B. pH Scale • What is the molarity of HBr in a solution that has a pOH of 9.6? pH = -log[H3O+] 4.4 = -log[H3O+] -4.4 = log[H3O+] Inverse log (–pH) = Molarity [H3O+] = 4.0  10-5 M HBr pH + pOH = 14 pH + 9.6 = 14 pH = 4.4 Acidic

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