Download - pH presentation
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Ch. 18 & 19 - Acids & BasesCh. 18 & 19 - Acids & Bases
pH
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A. Ionization of WaterA. Ionization of Water
H2O + H2O H3O+ + OH-
[H3O+][OH-] = 1.0 10-14
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A. Ionization of WaterA. Ionization of Water
Find the hydroxide ion concentration of 3.0 10-2 M HCl.
[H3O+][OH-] = 1.0 10-14
[3.0 10-2][OH-] = 1.0 10-14
[OH-] = 3.3 10-13 M
Acidic or basic?Acidic
[H3O+] and [OH-] balance each other, more of one means less of the other
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pH = -log[H3O+]
B. pH ScaleB. pH Scale
0
7INCREASING
ACIDITY NEUTRALINCREASING
BASICITY
14
pouvoir hydrogène (Fr.)“hydrogen power”
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B. pH ScaleB. pH Scale
pH of Common SubstancespH of Common SubstancespH of Common SubstancespH of Common Substances
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B. pH ScaleB. pH Scale
pH = -log[H3O+]
pOH = -log[OH-]
pH + pOH = 14
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B. pH ScaleB. 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
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B. pH ScaleB. pH Scale
What is the molarity of hydronium ions in a solution that has a pOH of 9.6?
pH + pOH = 14
pH + 9.6 = 14
pH = 4.4
Acidic
pH = -log[H3O+]
4.4 = -log[H3O+]
-4.4 = log[H3O+]
[H3O+] = 4.0 10-5 M