CH116lecture20P

CH116lecture20P - UMass Boston, Chem 116 CHEM 116 Buffers...

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UMass Boston, Chem 116 ©H.±Sev ian CHEM 116 Buffers and Titration Lecture 20 Prof. Sevian Today’s agenda z Equilibrium in acid-base systems z Finish comparing strong vs. weak acids (and strong vs. weak bases) z Buffers z When approximately equal amounts of HA and A are present in solution z Titration z Predict what happens to pH as you add an acid to a base, or vice-versa Announcements z There is a graded extra credit assignment during discussion sections on Thursday Nov 20 and Tuesday Nov 25. You must attend discussion to do it. z Next exam is Exam 3 on Tuesday, Dec 2 (first lecture after Thanksgiving break) – note date change from syllabus z Final exam has been scheduled for Tuesday, Dec 16, 3:00pm
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UMass Boston, Chem 116 ©H.±Sev ian There are only three type of acid-base problems 1. Predict the pH: given the amount of acid, base and/or salt added to some water, predict the pH of the solution. z How you approach calculating the pH depends on what you added to the water, so that’s the first thing you have to figure out z Variables are: strong or weak, acid or base z “Salts” in the Bronsted-Lowry scheme are actually acids or bases – their conjugates are more familiar to you 2. Equilibrium: given the measured pH of a solution, figure out how much acid, base or salt must have been added to some water to make the pH be that value.
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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CH116lecture20P - UMass Boston, Chem 116 CHEM 116 Buffers...

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