lesson 21powerpoint - Acid-Base Equilibrium Acids and bases...

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Acid-Base Equilibrium
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The pH level of mammalian blood must be kept  between  7.36 and 7.44, which is slightly basic.  Acids and bases play a major role in keeping us alive ! A fa ll to  a  pH o f 7.3 c a us e s  a c ido s is  to  o c c ur whic h invo lve s   na us e a  a nd vo m iting . If the  pH fa lls  to  7.2 the  b o dy b e g ins  to   hype rve ntila te . Lung s  re m o ve  C O Kidneys remove hydrogen  carbonate ions = pH of blood     increases = pH of blood decreases
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Acid/Base Definitions Arrhenius definition: An a c id  pro duc e s   H +  in wa te r A b a s e   pro duc e s   O H -  in wa te r Na O H (s ) + H 2 O Na (a q ) +  O H (a q ) HC l (a q ) + H 2 O             H 3 O +   (a q ) + C l (a q ) H +  + H 2 O b a s e a c id +
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HA + O H H .. .. A - + .. O H H H + acid base conjugate acid conjugate base conjugate pair conjugate pair strong Definition by Brønsted-Lowry: Brø ns te d-Lo wry a c id:   pro to n (H + do no r Brø ns te d-Lo wry  b a s e :   pro to n (H ) a c c e pto r Strong acids yield weak conjugate bases (do not readily accept  a proton). This conjugate base  is a much weaker base than water. weak
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The strength of an acid (or base) is determined by the equilibrium position of its dissociation reaction. Acid Strength A s tro ng  a c id’s  e q uilib rium  re a c tio n lie s  fa r to  the  rig ht, tha t  means ions dominate over undissociated acid molecules dominate at equilibrium. Equilibrium arrows not shown as equilibrium lies very far to the right that the backward  reaction is considered to occur.
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The strength of an acid (or base) is determined by the equilibrium position of its dissociation reaction. Acid Strength A we a k a c id’s  e q uilib rium  re a c tio n lie s  fa r to  the  le ft, tha t  means undissociated acid molecules dominate over ions at equilibrium. Weak acids yield strong conjugate bases
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This note was uploaded on 05/04/2011 for the course CHEM 211 taught by Professor Kelly during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lesson 21powerpoint - Acid-Base Equilibrium Acids and bases...

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