Lec-24-Chap16-5-bare

Lec-24-Chap16-5-bare - Lec-24-Chap16-5-bare 10/28/2011...

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Lec-24-Chap16-5-bare 10/28/2011 Buffer Solutions. Weak acid/Salt of conjugate base. 1 Lec-24: Buffer Solutions Chapter 16 1 Buffer Solutions As the name suggests, buffer solutions have the ability to withstand the addition of some amount of acid or base without changing their original pH by a large amount. Buffer solutions are made of approximately equal amounts of: weak acid and its conjugate base (HAcO/NaAcO) weak base and its conjugate acid (NH 3 /NH 4 NO 3 ) 2
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Lec-24-Chap16-5-bare 10/28/2011 Buffer Solutions. Weak acid/Salt of conjugate base. 2 Buffer Solutions If we add a certain amount of strong acid the acetate ion in solution will combine with the extra hydronium ions attenuating the otherwise large change in pH:         2 3 AcO aq H O aq HAcO aq HO  Conversely, if to the original solution we add a certain amount of base, the undissociated acetic acid will neutralize the added hydroxide ions, and thus attenuate the change in pH:         2 OH aq a H q O  We now turn to the quantitative aspects of buffer solutions. 3 Buffer Solutions Weak acid and its conjugate base:         A A 0 S B 0 HA initial concentration of weak aci NaA initial concentration of conjugate ba d se n C V n C V  When the conditions A3 B3 an H d O C C   are satisfied we derived the following formulas for the hydronium ion concentration and for the pH of the solution B Henderson-Hasselbal A 3 c B h A H O pH , o g pK l aa C C C C K 4
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Lec-24-Chap16-5-bare 10/28/2011 Buffer Solutions. Weak acid/Salt of conjugate base. 3 How does the Henderson-Hasselbalch approximation compare with the exact behavior when considering the pH of the buffer solution?
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-24-Chap16-5-bare - Lec-24-Chap16-5-bare 10/28/2011...

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