122ch17a_001

122ch17a_001 - 544, J __L_'____.;,L i '. " wag, I ‘9...

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Unformatted text preview: 544, J __L_'____.;,L i '. " wag, I ‘9 d‘k/ )1" I“ 1L” / 1 z./, I? - ,1 (wk/I *.._ (23¢ 1 I/ " z u I Had I HCH02(aq) 1:7 IH*(aCI) + CH02'(aQ) App/(I; eésatfifl/ mm _— i 0.100M 0.090M‘ hale w- ‘ #003, m c _x +x +x 0,8649% W.mc€/2‘g7k0, e (0100 - x) M +x M (0090 + x) M flggorié’p’ a” - 0—- 7: ' fi—Mfl __ H+ CHO . K513 “10-4: = W 3 mg (m, MW/fig —-~ {HCH021 (0.100-X) 0.100 gadgmll ft?“ m ______ - _ 7W }' rig/2” __.__,_____ W .0 _ x = 2.0 x 10" M = [H*], pH = 3.70 {We - Since the extent of ionization of a weak egg of Qa_s_e is suggressedpy the gresence of a conjugate .3313. the §_°_A: EH3 (4M; holds tag in Qu__ffer solutions. , Z . CsHsN(aQ)+H20(|) "’7 CsHsNH+(aQJ + 0H'(aCI) _H_ E 00750 M 0.0350 M C -X +X +X as; (90; 0 _ (-5 . e (0.0750 x) M (0.0050 + x) M +x M $44M?” K =1} x1043: = z 0-0850x —“*— " [05Hle (0-0750-X) 0.0750 x = 1.5 X 10'9 M = [OH'], pOH = 8.82, pH = 14.00 — 8.82 = 5.18 ""- 4.0 .51 .. .. I. 53.17% . A_ 41.351762:wigeixm'r’m A”? ll 'f’FC .' " __ _ éfiflmmfi #________ 7C ., _ _ 55' — El’x/a " V fi:::____ _ _ _ "Z __T?<F_TI//*P 9135’ wig '7 i"'Z§i§g;zp?3 ééZzEI—j _ _ ~ ............ __ _ flaw/47" .___-. _ _._.. . Wi/Qfidfi _ . __ _ .8 Mrék fig; % 112/0 42%. Jim)“ @ / Z 2! chHaoz and Macy-1,02 are a weak conjugate'acidlconjugate base pair which act as a buffer because unionized HC,H302 reacts with added base, while cal-I302“ combines with added ' acid. leaving [H‘] relatively unchanged. Although HCl and KCI area conjugate acidlconjugate '___m base pair. CI‘ is a negligible base. That is, it has no tendency to combine with added acid to form unionized HCl. Anyadded acid simply increases [H‘] in an HCIIKCI mixture. In general, the conjugate bases of strong acids are negligible and mixtures of strong acids and their “‘— conjugate salts do not act as buffers. _ A, I / 5M7 x= Imam] it I gflfifibfi /7.2§ ) NI-IlglNH3 is a basic buffer. Either the hydrolysis of NH3 or the dissociation of NH; can be . used to determine the pH of the buffer. Using the dissociation of NH4” leads directly to [H‘] “m and facilitates use of the Henderson-Hasse'lbach relationship. I ‘ ‘ I / _ 64!? __ /, .mmmr _ M . i ' 5e .-= I‘M ...
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This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Summer '07 term at Ohio State.

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122ch17a_001 - 544, J __L_'____.;,L i '. " wag, I ‘9...

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