# Lecture 11 - Salt Solutions KaKb = Kw = 1.00 x 10-14 at 298...

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1 Salt Solutions NH 4 + + H 2 O NH 3 + H 3 O + ) NH ( K K ) NH ( K 3 b w 4 a = + K a K b = K w = 1.00 x 10 -14 at 298 K (for conjugate acid/base pairs)

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2 Acid-Base Reactions When mixing acid with base, the reaction proceeds in the direction from the stronger to weaker member of a conjugate acid/base pair. What is favored for each of the following? 1. HCl + OH - Cl - + H 2 O 2. NH 4 + + OH - H 2 O + NH 3 3. HClO 2 + NH 3 ClO 2 - + NH 4 +
3 Polyprotic Acids What is the pH of 1.0M H 2 SO 4 (aq)?

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4 Carbonic Acid 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
5 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 to derive: When [H 3 O + ] 1 x 10 -6 M, this equation reduces to the usual one:

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## This note was uploaded on 04/16/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

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Lecture 11 - Salt Solutions KaKb = Kw = 1.00 x 10-14 at 298...

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