Lecture13_S08

Lecture13_S08 - Feb. 18, 2008 Lecture 13, Chapter 16: Acids...

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Lecture 13, Chapter 16: Acids and Bases http://genchem.chem.wisc.edu/demonstrati ons/Gen_Chem_Pages/14acidpage/acidm ain.htm 1 M HCl (aq) + Na 2 CO 3 (s) 1 M H(OAc) (aq) + Na 2 CO 3 (s) Mg o (s) + 2 HX (aq) MgX 2 (aq) + H 2 (g) In the above left case: 2 H + + 2X - + Na CO 2 HX 2 NaX + H CO CO 2 (g) + H 2 O (l) (aq) (aq) + Na 2 CO 3 (s) 2 HX (aq) 2 NaX (aq) + H 2 CO 3 (aq) Several lessons can be extracted from the above experiments but we will focus on two: - Reactions typically occur in the direction to form weaker acids (or bases) - Rate of the above reactions depend on the strength of acids, The more dissociated the acid, the stronger the acid, the faster the reaction Measure relative acid strength by either K a ’s or pK a ’s H + (aq) + X - (aq) HX (aq) K a = [H+][X-] [HA] Acid dissociation constant Conjugate base of weak acid HX Is a fairly decent (but not strong) base, It can pull a proton off water or H 3 O + 0 1 7 0.0000001
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This note was uploaded on 04/17/2008 for the course CHEM 2 taught by Professor Ryan during the Spring '08 term at Marquette.

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Lecture13_S08 - Feb. 18, 2008 Lecture 13, Chapter 16: Acids...

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