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QUIZ 3 2011 - Chemistry 222 Name Spring 2011 Quiz 3 Heng...

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Unformatted text preview: Chemistry 222 Name: Spring 2011 Quiz 3 Heng Leah Vitaly Yichen (circle TA) Potentially useful information may be found on the last page. Be sure to show your work. 1. (10 pts) A 0.050 F solution of a monoprotic base has a pH of 8.64. Determine the base’s Kb. 3‘. Fingru oUL) <- on {as} + 833+ (35‘) 1c 1 .35.: vph ‘33»‘3 47 U45 84“]: 30‘?“ b 3'3 um- :Wnu w :2 {our} 2 Woem'fl'“ aims. 3:33:33 M moss-.M‘cwgflo‘é —, Lhmwo’W/Io'm’q ., noun; 5-7" WWI a . _ o' '1 353°th )C (0’: :“7 t 33.3% X [0 ‘ K ”M‘Wmm“ 1' HAN x we 2. (10pts) What 1s the pH ofl. 00x 10—7MNa0H? {Hues} 106ch cu AWfifio Wubm£ UV“ 32-; NW7 N) 'Me 1333mm: 3333‘3 Jr $091353 1 (tam: [w‘l+ E1093 :3 mmm :Noong'qmi {035:3 ( 11320335 {(93 « Enujiuaoflv [£35031 (£33031: ‘I' I on \< 10 a) ,‘3’ H [P :2 59.3333 {“331 Jr 1 on x m 3 E1150 1 IMWWWMMW :7 (95.5%] - -3 + , we: 3 w imam} ~. "0° ’3 ‘0 ;$£:WEE>VW2M(WIIIO > (1., gym x to"; [+3 9v :7 42R =3 $5333 '71:: 103;! 3, (5 pts) When can you use the formula pH=(pKa1 +pKa2)/2? 0193332232? 335 4» m3 3:: 33323 (on?) 3033333? 04033433“ “x g: u M Mu oi g H 33(3 414A (.3 . (3s, 2, ”j? 3 é éeg‘; “m, 3331 (33:? 3 33 $3333} 9 I353? £33 3 5'33?“ 33) HA ‘5 g” mm “W3 ”0 Pua' " {1333‘} . W 3) RN“ 3313 iéfiiJfi 33.3325. 353% , 3. We ‘0 K‘ LL 1: ‘3 a y F @3333. =7 E33339 313,931 :1“) VEHJI; (fimgm\+ «$335732» 2 § [figméew‘et (“can“) “v L8»: as ”‘1 4. a) (5 pts) What is the pH of a 0.10 M acetic acid (CH3COOH) solution? Ka = 1.8 X 10—5. \ .i ., i , .. eagfieiéwaga used) 1% fig:i£éy) # £23545? («12> . ”9 *2" a x5 KLMWEKVO a? x= comma; [maritfiifié ‘50:“ M spite» 23152. a l 9.53% Lass] fl“! [we m mean masm Macaw] b) (5 pts) What is the pH of a solution containing 0.10 M CH3COO and 0.75 M NaCH3COO? wFFgfl/t ihv‘lv 0;?5 [— vet‘s “flirt“: 39%?“ m0 9” “£9810 (($22 i043) #99390 W = Mom ems? wi§@l\ [swam 4: 9.2mm : Wt} c) (5 pts) What ratio, [CH3COO']/[CH3COOH], do you need to prepare a pH 5. 0 buffer? M if Hm” HWH .00 [Win we“ ”we-“w 5.00 ”saw E “F P 3 m l 0 :5 NW1. i’ 5‘9 ., r e i i [ .... z . -.~ ”W - [th 00 5% 1 l.%’j i \ d) (5 pts) How many moles of CH3COOH and how many moles of NaCH3COO do you need to prepare a liter of the buffer solution in part c) if [CH3COOH] + [CH3COO'] = 0.040 M? v- t - -. ' -; . [Ream-t4 5;“ 3” [*0/39 F giggliv 1'le (NW 0 1%; UM}? meadow] [Pr] ' t ‘8 {and t ‘i‘ mm“; 'Wo-QN W86 0 " ' o XXL; Oflwwxm‘i 1‘. gggebm‘ies east? «:7 Damon» 0.96? meets} Lacey}: 0.031%th e) (5 pts) Consider a buffer made from an acid whose concentration is FHA and the sodium salt of its conjugate base with concentrations FNaA. Do a systematic treatment and give the equa— tions needed to solve the system. Number each equation and identify what it is. DO NOT SOLVE THE EQUATIONS. is ; {Raj 1,331,1qu mgm} LOW} 00mg Miami {Lamb EDME= tag: a» WWI ’5 ;\ maw& barium; ', a)» Fug 4' Pg“; a [Math LIVE L) KCDLQ‘ ifi‘fl 23> EMMU: at} mt. - we : wisesizia‘lgteml ' ‘V 5’ “mews ' b) fik‘ifi'k* it”, isfioslzew} ' 5' Icé’autififlm ...
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