Determine the pH of each of the following solutions.
(a) 0.213 M boric acid (weak acid with Ka =
5.8e-10).
(b) 0.394 M phenol (weak acid with Ka = 1.3e-10).
(c) 0.869 M pyridine (weak base with Kb =
1.7e-09).
Having the general reaction:
Acid: HA + H2O = A- + H3O +
Base: A- + H2O = HA + OH-
You have Ka's expression for:
a) Ka = [A-] * [H3O +] / [HA]
5.8x10 ^ -10 = X ^ 2 / 0.213
It clears X = 1.11x10 ^ -5 M
pH = - log 1.11x10 ^ -5 = 4.95
b) 1.3x10 ^ -10 = X ^ 2 / 0.394
X = 7.16x10 ^ -6 M
pH = - log 7.16x10 ^ -6 = 5.15
c) Kb = [HA] * [OH] / [A-]
1.7x10 ^ -9 = X ^ 2 / 0.869
It clears X = 3.84x10 ^ -5 M
POH and pH are calculated:
pOH = - log 3.84x10 ^ -5 = 4.42
pH = 14 - 4.42 = 9.58
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Determine the pH of each of the following solutions. (a) 0.213 M boric acid (weak acid with Ka = 5.8e-10). (b) 0...
Determine the pH of each of the following solutions. (a) 0.532 M phenol (weak acid with Ka = 1.3e-10). (b) 0.277 M hypobromous acid (weak acid with Ka = 2.5e-09). (c) 0.713 M pyridine (weak base with Kb = 1.7e-09).
Determine the pH of each of the following solutions. (a) 0.410 M propionic acid (weak acid with Ka = 1.3e-05). (b) 0.122 M benzoic acid (weak acid with Ka = 6.3e-05). (c) 0.867 M pyridine (weak base with Kb = 1.7e-09).
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Determine the pH of each of the following solutions. (a) 0.416 M hypobromous acid (weak acid with Ka = 2.5e-09). pH = ___________ (b) 0.644 M ascorbic acid (weak acid with Ka = 8e-05). pH = ___________ (c) 0.703 M pyridine (weak base with Kb = 1.7e-09). pH = ___________
Determine the pH of each of the following solutions. (a) 0.492 M carbonic acid (weak acid with Ka = 4.3e-07). (b) 0.770 M benzoic acid (weak acid with Ka = 6.3e-05). (c) 0.697 M pyridine (weak base with Kb = 1.7e-09).
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