pH presentation

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pH presentation

  1. 1. Ch. 18 & 19 - Acids & Bases pH
  2. 2. A. Ionization of Water [H 3 O + ][OH - ] = 1.0  10 -14 H 2 O + H 2 O H 3 O + + OH -
  3. 3. A. Ionization of Water <ul><li>Find the hydroxide ion concentration of 3.0  10 -2 M HCl. </li></ul>[H 3 O + ][OH - ] = 1.0  10 -14 [3.0  10 -2 ][OH - ] = 1.0  10 -14 [OH - ] = 3.3  10 -13 M Acidic or basic? Acidic [H 3 O+] and [OH-] balance each other, more of one means less of the other
  4. 4. B. pH Scale pH = -log[H 3 O + ] 0 7 INCREASING ACIDITY NEUTRAL INCREASING BASICITY 14 pouvoir hydrogène (Fr.) “ hydrogen power”
  5. 5. B. pH Scale <ul><li>pH of Common Substances </li></ul>
  6. 6. B. pH Scale pH = -log[H 3 O + ] pOH = -log[OH - ] pH + pOH = 14
  7. 7. B. pH Scale <ul><li>What is the pH of 0.050 M HNO 3 ? </li></ul>pH = -log[H 3 O + ] pH = -log[0.050] pH = 1.3 Acidic or basic? Acidic
  8. 8. B. pH Scale <ul><li>What is the molarity of hydronium ions in a solution that has a pOH of 9.6? </li></ul>pH + pOH = 14 pH + 9.6 = 14 pH = 4.4 Acidic pH = -log[H 3 O + ] 4.4 = -log[H 3 O + ] -4.4 = log[H 3 O + ] [H 3 O + ] = 4.0  10 -5 M

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