Exam 2 key_A - C EoWUE Exam 1'ii‘ersion A{1'9...

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Unformatted text preview: C] EoWUE Exam ] 1'ii‘ersion A {1'9 l‘ebruar}r 2W6 Multiple Choice Section: 1. identify the conjugate base of 14?qu— Pt. H20 B. HEPUJ (i. Hal-’04 @D Pofi' I—Z. ' 2. The Km for silvcrfl} phosphate is 1.3 x lfl'm. Calculate the molar solubility of' silver“) phosphate. .4;- t :3". .. a W) _ pogattsmap‘fi “ 90“: “it” Dfigi L" Lexie-5M -—- ’5' g . E .2.]x1fl'5M -x *3”: it“ :(5fi)(s¢> c. 3.? x 1U”5M -- 3?: 2,; pt n. 12x to] M "‘ '= 2.13s 6 .1 — 3. 1|It‘lti'l'tich of the following is a true statement about chemical equilibria in genera}? D. At equilibrium, the-rato-eon-stafit of the forward reaction is equal to the Fate constant-{or the reverse reaction. (EDEN equilibrium, the rate of the forward reaction is equal tools the £13: of the I‘BVCI‘SC l'CflCl him. 4. At Tflfl K, the reaction BSDgfg) i- 01(3) '—-—, 2301(3) has the equilibrium constant Ki,- = 4.3 x lti'f' . and the following concentrations are presont: [$02] = [thi M; [503] _ tD.M;[Uz]—'[}.1{JM. (g): M a Ugo; 5 r-F-‘H 1.0x“:- - 1Q: . libido)?‘ {an Aictigilfi‘ ls the mixture at equilibrium? If not at c uili mum, Il'J. rcctton (as the Q Lil; equation is ua‘ittcn)= iefi to right or right to tail, will the reaction proceed to reach equilibrium? +0.3 m fwd-5‘ re? A. Yes, the mixture is at equilibrium. @ No. kg? to right :. No, rig I m t'efl n I'm. :.. ._..t .t.._.......I.. :..4‘h-..u.i:...u a... L... “Lt” In. “cm-that tl-m Hirnn+:nn C136Wflfi Exam ] 1Version. A Di) February 2005 5. 2.50 mol NDCE was. placed in a 2.5!} L reaetion vessel at NUT. After equilibrium was established. it was found that'EE‘l’a of the NUCI had dissociated aeeording to the __—._n—————"l| equauon ENUCltg) ‘: ENCHQ} “27a : [Olfilmj Calculate the equlltbrium eonatant. K.“ for the I‘EEEUUI]. 1 LC! €23 El _ 2 amt H 1 M K: END} Leta}. .mm a" l 7’" #11:" C. 0.159 E 1-045 1% 7’" {will > D. 26 of—t'z. olfii D t”: .. W a O 02.1 4? 1 6. The equilibrium eonetuut for the reaction Ni[e) "a 4CDtg) LT- Ni{CC:-}4tg} L1 is 5.11} x ltli‘ at 25°C. llNhat ie the equilibrium eonataut for the reaetiou Ni[CO)4(E} ‘2... Hits) meow)? tel 2.0x iii-5 I. we @25le (-2.: 'K : 2+0“ E e. Sflx to“ t 13.5.th 1o“ E. 2.0 x iii-3 ’5'. For the following reaction at equilibrium. which one of the ehaugea below would cause the equilibrium to shift to the lefi'? 1 P EfleW-L -. 2HOB~r{g) 5:; 2N0{g) + 3mg), ell-fix” = 313 kamol fit. Increase the eoutuiuer volume. .——? gnaw: “Mitt Ml“: “L 25 B. Remove some ND. -—'3' rum“. grandam“ C. Remove some Br; . 4- ' . (An-1'1.- D. Add more NOEL r—r=p mad “1"” @Deerease the temperature. £———- rm“. M+ H__._——.—--—- 3. What 15 the pH oi'a £120 M solution ofNHdfl” [bel‘Jng = 1.8 x lfl's] w:- ‘I' ... E: A. 3.14 kl WA- r’r i'r—' ‘3: Ar 1‘25? to. K— m a Ila @433 ; [Lib __ ee- cfihx m C. 6.53 + .7; +3; D ELM C' -' 3"- “; x E 10.25 E 0120;): C] EGWDE Exam 1 TIHersion a G9 Fe'ort.rtlr‘_~,r 23136 9‘. You are asked to go into the lab angi prepare an acetic acid - sodium acetate buffer solution with a pH of 4.130 2|: [1.32. What molar ratio of CH3CUUI‘1 to CH3CDDNa shouch be used“?I aghfl {run A .l‘ a. are . E" a. as: rat-t a 9m T is.)th ' 0-1-19 L1.or.>=I-t.:}~t-t to ‘5 @sso 3 7’;- E. {HG $6110.18; HJI. Which one of the following statements about strongz,I acids is Irue‘? A. HCJL’HZL cit,“ E) Strong acids are 106% ionized in water. (I. The conjugate base of a strong acid net-Hr a. boas-Er D. {an can M1 dogma-oh?- Maw Maw 1.: 3 1 ]. Calculate the 11+ ion concentration in a 3.8 a Hit"4 M Cam-lggsoiution. _. - r — ~35 asaxro‘jM [ea 3: zLa.gam“*)aLgmts M B. L8 x I'D—‘1 M 11+ c. a.2:»:m_L1 M CDWBEWJQ’} .-. Lexie n. |.1><1fl M _w_ @5.rx1o'”M fwTfi-argfilk to 12. Calculate the I-I+ ion concentration in lemon juice having a pH of 2.4. -2 '- “PH a. 4.0x“) M gift"):— HE) E. 250M "—2.4 c. 0.38M a H3 @ 4.0x to‘i‘M * 3:» a. 12M =- 39‘9310 13. The reaction 280mg] —"——x ESflfig) + 02(2) is endothermic. If the temperature is increased, add firm-t- :7 -.._———-:—--——--——' A. Bq—KCAm-l-Ldm 'tr'H—‘C-L an Fszi d 1: kt; MW C41?“ 3 “fl ® KC will increase. El flag Fmranwnfl] dPEFiyalwet Wu wrt. W C1 BEWDG Exam ] 1tfi'ersion A ()9 February 213% 14. The pOH of a solution is 11140 {gaieulate the hydrogen ion concentration in the solution. A. 4.t'}><IU'”M PR: v4 _ It'll-H3 B. 3.6M r" 3‘ DD?“ {3. 4.lefl"mM - "T .— @15x1fl‘4M W3; “3 _ s. as»: ID"M sax—3 x10 15. Whieh is the eorreet equilibrium constant expression for the i'oliowing reaetion? W3H2{g}:sietsgssugotgj «mhfig mot Wm V— A. Kc = [Fegfla] [HitJ fr iFfl'izil'llm‘i3 1: a x Emd‘flum B. Kc = {1121;11120] ‘L Ekh033 M = [$013! [1-1313 ' this} “ n. K. [Fgflmor‘r treats] [1-1213' Etflfimwb E. K: {FE} [Emil-1413201] [H2] . . . . 'L “d "r 16. "What is the 131-} at the eguivoienee mmt in the titration oflflt] m]. oft].lfl M HEN (K;I LE) 2” 4.9 x 1D"”’) with 0.10MNHOH‘? eel {2+ {a} ma mi. d- 0H” memo. -- ~ 3 7* 33 Drew. +oH*—=.r EN" + Has) :3 Hm 4: EH" three 5 L» I 0'05” 9-” 2’ “‘0' e. - a: +1 4*“ I x .7. 111} E owed-“>4. 3': at , H.121} @fl‘i’ofi skw' B -. . . . . . "PM: Lo M13 H. You have Sflflfl mi, of a buffer solut1on eontammg {130 M acetle oe1d {Cl-13CDDH) and {1.213 M sodium uoetote {CH3CDONa}. What will the pH of this solution he :- Coir?) after the addition of2fll.t'} mL fies M Ns(}H soiution'? [K.. = 1.3 x 10'5] putts 3e. “4‘35 190%: [email protected]—$’ 01%- 4: H13 EHMLDD 1 0.150%”. Ofilfimt o iota-wt r-- D434flflqm r-D-UZD +oo1o ‘“ F 50? a menu. 5;: DATEDMI *3 H ' L— 0 521a 1- — t Fifi) acre.- M. .-- r E) v.- -=- [his “In 9* i” e ClBthlfi Exam 1 Version A to February cone 3 (We _______._e ll. Prcclict the direction in which the ecuilihriom will lie for the following reaotion: HzSUfiEQ) + HUG? (at!) H? “SCH—{3‘31} + H2C03'lflCI) “LSD 3' I Hm; The Kfla are given here or you can use the acid base chart in the hack of the WT exam. KflmHgSUfl= l x ltl'z; KalfiHgC03}= 4.2 x lit"? +3 Arm 3 -'3— than; «- tho :2 H503; a Peel new t we @to the right I _ mg a. in the middle w; F. J. “Lu 2': aloe. + CH lie": 2 Fix” c. tothelcfi {3:91 + H UTE: 1 “Lb : t: . . ammafier + W I a. up . :35“ 39. Calculate the Silver ion concentration In a saturated solution of 51lt=cr{l} au ate '4 (K... =1.4 x 10"). Jr of a“ 25x 1.3;. t We :3»? +324 espet Hero; ~—-——> a. 1.5xlfl'2lvl to E _ 1 ZED 9,3 6.4XJH'EM I m 143* K ¢ l:ng ‘4” *. .uxitfiM .5; Eu: +11%: 1b.“) o. 1.4x1t]"5M g f "int-1 “ti ” (2"; 32% E. None of the above. F -a “UK F 35-. _ >13 0.01:: :: Goa-D 2t]: 1Which one of the following combinatiounction as a buffer solution? A. HCH and KLth 33. NH; and {NI-ltngOt @IW03 and Halli); Hm; R; Q D.__ HF and NaF I E. HMO: and Hal“); 2] , Calculate the minimum concentration of Cry that must he added to H.095 M Hal" in order to initiate a precipitate of ehromiurntflll} fluoride. (For (3ng . Km = {3.6 x -.]l m laE’Ur-ic mm £2 3* lint r a. tlt'lEflM K6 C???» a: C" 3% {1032 M g - 5” [lip-r ©JHUJM ? Ear 3 33} .1t o. 2.9x1tl‘9M . 3+ {aggro -:_ {ll-extol a. 6.9x tower ($5? 3 EC“ 3 Cl sawed Exam 1 1'i’ersion fl {3‘} February aces 22. identify the conjugate acid of 304 ' 23. Assuming, equal concentrations of conjugate base and acid, which one ot‘ the following mixtures is suitable for making a buffer solution with an optimum pH drag—as? it made) twig, bees WM” “PM” m H a. CilgflflflNai'Ci-hCDDH (Kai 1.8}: iii-i) PM Inmate! {amass to”) (1% .é_ a._ 143.5 i aCICI i HDCl (Kc. = 3.2 >4 143-3) u. NHNUQHINUQ (Kiwis x Hi") i {an a. NaCHl—lCl m-t on “We __s. "24, 1|aili'hich ol'the lbllowiug will act as a Lewis acid? a ' "3 “fl '- ,. .I L .d : A. NH} H." E‘H "3E3 fox El / new "II 'a. rail-14" a H + Pr H E 5,612 c HQD {flaw a / x H =-'~ tat e t t 59"“ 25. 1'w'bicl't solution will have the lC‘IWEtii PH? «4? rune—l- {Ll-{*3 a. atonich wa ~ + UJUMHND; apt—a: 1m)!- ream. or? H {3. [LID M NaCl marl-um l1 {lull} M HgCUg WA E. fl.lDMNaDl—l an; 26. For PbClz {K513 =-'- 2.4 x [ti—d], will a precipitate of PhD]; form when Chill] L of 3.11) x to1 M Pbmth); is added td'doo mL at" no 3-: to"2 M NaCi‘? 1+ 4 " L- 2.th it) A. YesbecaustesKm fioCll Ei 9b: 'l' 2L1 L510 @No, because Q a: Km C. No‘ because 0 - Kip. (Q .2 E ij’l'BECJFBDJ D. Yes, because Q { Km 1: Q: PDKmE)(.G-Ujr2fi) an CifioWflfi Exam I Version A 139 February 2W6 2?. Ell-“inch one ofthe following salts will form a neutral solution on dissolving in water? well] M at fl'W with w: beta stems Ag?” -t No; es— wt: C‘Ham M 4r CN' £— twig D. Nl'iaNU3 NH -r . l-i ‘1' null-— E... E. FCCl3 art W W . t“; “gar” s_ Lem“: and 23. Phosgene, CDCIQ.’ a poisonous gas, deeomposes according to the equation C(lfilfig) ii“ eotg) + Ctgtg). lt'jaleulate KP for this reaction ich {1.1133 at QUGGC. ©3125 ‘lLf: LCLETDbh first: _.~ 1 .U' _ I g 1 e. s. r. 34;. Gr?) I =(oee9910-03211nse) +1 {an 29. Which of the following would decrease the Km for Phlg? L57 5W 11.3: m1 14H- 01f A. Lowering the pH of the solution at a a...” L 3. Adding a solution of 13thth “‘1 if” . _ K i T C. Adding a solution of K1 £3 3 C D. )None of the shower—"the K3,, of a compound is constant at eonstant emperature. W “" W 15’ 3t). Caleulate the all ofa solution that is 43.411? M in HOCI and llflfitl M in NaOC-l. [mttoen = 3.2 x ltl'fl] #7 f“ Uh ft. [3.39 J B. 3.94 lav—Elf (7.36.53 D. 149 3;. 3.43 W: ?¥_fi* nah E Pt s. it: Lfi+ W) Li‘s“- ' Q .“1 l D eta/5% {31 36WUfi Exam 1 Version A ['9 February Eiiiifi In signing my name to this exam I attest that I have neither given nor received help from any»' unauthorized resource on this exam. Name: UMID: Recitation Secéoflrfl/ Nb Free form Questions [20 points total} Momma “‘5 "l g; 1. [10) You are given‘tflflzfiifiiL of a 0.050 M NaNDz so ution. Calculate the following information: Equilibrium concentrations of all species in solution, including Ng+_ the pH. the pUH and the percent ionization. Kw RENE: d —'_'_-_-—r .F _________-—-—" m; + 14.2.0 we. . not); + OH kb: MM?) WW6. H Q] g cm newe) i a. + *7: “mt (QM in L I x. )4. ~71 \va‘: ’2, 17am E assure - 3‘- kb ": 1x ) csbfihl33¢ we 10% we is“ M = Can”) tEHNUJ wit '4: '5 “fir on“; 25 .033 * ~51 ff] 2 lb? : 531.1%}: it) ED C ’ .: QefiD-r‘x 1‘ 0-0 [NH-L] O-CEOM Mu} 5 [N0] ecsem a ; i-urxilflzi La‘sxtcrl-a M ‘MM 1 )1: % ma : 2 WED . .[UH-J Lad-jog me-e M / Him Olflfib [H301] Ft.qu its—“l M. pH 5.03 le-I gqu— _2 ll, 4! ' {E‘s-l ‘B m C] sswos l4” ‘3’” War- Exam 1 C” VEISlDfl A 139 Februaryr 20136 2.11113) Explain how you would make {1.5m} L of a {JESM buffer with piifl using anyr of a 1.12] M stock solution of BEECH, solid potassium bicarbonate {KliCUg}, and solid potassium carbonate {KgCUg}. Your answcr should include both a numcfififlljlliw r and instructions for what to do with those answers. I as a; so mag use: was. a- - i to??? am; Hts-3 it: an CD15 ""_' P Aw 5dr {3,603 L L902: b5?+ltj%. {Jr O-iwgm‘rlrzlafla ... ll tin/fill M 5*th E. s 0.1494, V Pf w \Jr aw? 3'- _ r3 1 l _ F. D \J [1633; “mm LO 1461mm) cg > i“ :"x. ' F higiiiuss n I 01: W-rt 03::qu 4W 52¢ 95W“ O x+ottibsc=UZSM1 Ologgmbiifi sQJiEDVK'eClt __ U3 mist: “fill 2K 143 “X {31%‘5‘5 i“ mg “mg 3 n: G‘ "- I E633 m1 flufiw ...
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Exam 2 key_A - C EoWUE Exam 1'ii‘ersion A{1'9...

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