Chem_215_Lecture_10_color - PS3 Due today, PS4 Assigned 1...

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1 PS3 Due today, PS4 Assigned
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2 Polyprotic Acids What is the pH of 1.00M H 2 SO 4 (aq) ?
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3 Carbonic Acid (H 2 CO 3 ) H 2 CO 3 (aq) + H 2 O (l) H 3 O + (aq) + HCO 3 - (aq) K 1 = 4.3 x 10 -7 HCO 3 - (aq) + H 2 O (l) H 3 O + (aq) + CO 3 2- (aq) K 2 = 4.8 x 10 -11
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4 Very Dilute Solutions of Acid or Base Strong acid or Base (100% Ionized): Use initial concentration in K w expression to calculate [H 3 O + ] and [OH - ] from water autoionization. For Solutions of Weak Acid or Base: Use charge balance and mass balance equations. When [H 3 O + ] 1 x 10 -6 M, this equation reduces to the usual one: ] O [H K - ] O [H ] HA [ K - ] O [H ] O [H K - ] O [H ] HA [ ] O [H K - ] O [H ] O [H ] HA [ ] ][A O [H K 3 w 2 3 o w 2 3 3 w 3 o 3 w 3 3 - 3 a + + + + + + + + + = = = x ] HA [ x ] O H [ ] HA [ ] O H [ K o 2 3 o 2 3 a = = + +
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5 8.1 The Common Ion Effect Recall that for polyprotic acids, the production of [H 3 O + ] from the first ionization greatly inhibits the second
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Chem_215_Lecture_10_color - PS3 Due today, PS4 Assigned 1...

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