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Lecture 142/19/06
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Strong Bases: What is the pH of 0.01 M solution of each of the strong bases? NaOH CaO
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Weak acids and bases HA + H 2 O ↔ H 3 O + + A - HF + H 2 O ↔ H 3 O + + F - K a = A - + H 2 O ↔ HA + OH - F - + H 2 O ↔ HF + OH - NH 3 + H 2 O ↔ NH 4 + + OH - K b =
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Fig. 16-1, p.770
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CH 3 COOH (aq) + H 2 O (l) ↔ CH 3 COO - (aq) + H 3 O + (aq) K a = 1.8 x 10 -5 CH 3 COO - (aq) + H 2 O (l) ↔ CH 3 COOH (aq) + OH - (aq) K b = 5.6 x 10 -10 2 H 2 O (l) ↔ OH - (aq) + H 3 O + (aq) K w = K a K b
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What is the pH of a 0.05 M solution of benzoic acid ( C 6 H 5 COOH)? K a = 6.3 x 10 -5 at 25°C
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