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Cabrillo College ,, Chemistry 1BName: KO YClrcle Lab Scction: Bonus lpt (f) MW ll;fllamEnm #2Spring2fi)4Score:_(2)TTIrg:oorre2:3opmPlcace rhow all cekulrtlons rnd pruvlde r detalled crplrnrtlon of how you errlved et your onrwcr.You nay ure dlagrems, plcturec, grrpb$ charts or rny other forn of rcprcccntatlon to erplrln youraBswenPert A: Ellry Type Quertlonc: You neod to relsct only tf of tho 5 quertlonr frcm Prrt A:(l0pts) l. A gas phasc oquilibrium exists in a closed system between NO, Oz, and NOz, according to thcfollowing chemical equation2NO(g) + Oz(B) <=:> 2NOdg) + ll4KIDescrib€ any shifts in thc position of tho equilibrium after the following changes.a. Some of the NOu gas is removed fromthe systenth;l b F.-q/-ttqb. The temperature of the system is decreased.w4,x(10 ptr) 2. Water, H2O(l), at room temperatue is poured into an empty bottle until it is half full. The bottleis then cEpped. What, in detail, happens to the water molecules in the system &uing the approach to and atequilibrium?LI osesyc{gaa-1,(*roru, ,,"t%.il-*- &Mq-Obk u-/4*tAI4 t.o,I(/o-Jai'\9-A g^,oM sa&kta--,t o- flrdtG<e(10pt ) rl,. Apange tbe following O.l0M solutions in order of increasing [f concentation:a)NIl+NOr b)I$IO3 c)HNQ d)KOH e)NH3Plcasc crpleln why you chose thlr order:Kort$ Ftsfrr a5bo-ge ,"4{,.t( lr o.p eaf r*lrlu{-., t?o=w eoV\VAc-t d><.F{^rq,Sfto't1 h;, Ll.) FIf t t+ Lo *=2 et tt -r $ ut.dil= t r-tr uc -- d ef/* o 14:(10 ptr) 5. A weak acid indicator HIn is added to a solution which has a [H+] whish is 1000 times the valucdftn-,e Xa of HIn- What is the color ofthc solution ifHln is red and In- is yelloW'? Erpldn your thlnking.F\n t 4.p = Hrott I-.,- -l^:-,- G"{ =[xZa)R.L y eilo,o co! or I oi-<"ffi er,r ^t-t n- -) ,"'1,-^ fru-l > lr+foJf,t ^11 t _ J) rYu\ta4 Lfr/ J ? Lt-tt:/ _LffrO )LJ_1DJ a-t , . t^Ro,--F:: Co[",r'. Ye[{o,^t'?+ firotl =t,oor&ru =>,#r=rffi! Z/iltL5cr J: uvrPgrt B: Problems: You must do all the-problems -'-" - L+ fq{!rt= rc9e",ffr6l(f5 pts ) 6. Calcularc the pH for 0.50M C|{'COOH solution. Thc Ka for CHFOOH is l.E(Please show all your work and vatidate any assumptions mado)a) Write a balanced chemical rtaction.C*reoob+ r t+Lo =b) Show an ICE tableI @. ttor-tc +7,E o,So-)t-uq-Kr _7,P ler o-sFt+= z,g1v*njt4"1Lt*r!oot7vI + 4=ottf+7--.J-lo +7.s-b {K*=t*"c[=W-rttultutoQf4rotl =Crfr+(Determine theg,Sp-Xz 42.S-b#r>-+.tr?d-= FWhat is the % dissociation?,c*rof] )6reo zC**-(,3,o lt(o -* ,* = brbOZoO,fZ *' -Multipart Problcnu You uuct chow work to rcceive prrtlal credlt(30 Pb) 7. Prrt l. A chemist is dweloping r now acid basc tiration analysis for loctic acid (CrHeOr).Lactic acid is a monoprotic acid with K:8 4 x l0{.a) Writo a balanccd chomical reaction for the dissociationnf lactic acid in water. . /- r tJ-b) wha, is #*ieffi ##,'.##f{riffi'ffi:#*" #,*;,1**TI "- "0.500 M NaOH to rpach the cquivalence point.t f , t6:11 0,loo Hl [-tg. Ln = 'o,Jt'-'1LJ + GteO = l*Lec-t ovt_ L/fu;o,oszz ; - ,o:? obuo; Q*--6__ - tz *y trc *=- coutl--\W"tlv (+(^-u-- 6,\fttgt4 r Lo,OottaL_/ OVtOOa-Lboz + Ftro 3: cz*"o{.ft=dM ,o"# V**+-- (Trnnu(MnuFVon- +lwrro(ti^ *tal). (,,nal ttCo.I o"ta(, O (( -c) Calculato tho pH at the equiquivaE::::::::::::::fpoint. ,t, . Kra3r>4,1 , LI n -.s tLl - t rr r--t - r/f + etrcr = blLoc-+ ovt:[c^.J z= fufu"oaosz3= o,ttira*p?)bL o"D6Z\_v z /;+*,, \ ' "::"'{_tzo7 @t o,o1,;B3-n aypzs1 =?'7etr"-td) Circle your choice of indicator to use in this titratbn. Erplaln why you choce it. 1 t oa t.1.* s..t. Thymolblue pK6,= 1.65 Reca-rzs d' ' to t & - n VotlzL'oo2. Msthylorans€ IF.::f ?Vn-- ^= pAI t- t Tr-a-* sitr.,,,c pt\=/U-Fqnffo 3ff=3:il3 ?V rwu= p* t- t -r{-a"* si tr.,,,cffi o* Ji, .b , Ro^1€- 78,oo=s.20 , I y4..J",: i , , .,r' rutuvrurus PAIIin 7''w = G,ZTE y.3O iucl*l-s p{,{@e€pT"Psra2. A buffer is prepared by mixing 600.0 mL of 0.500 M lactic(Cfieog) and 400.0 mL of 0.500 M o 'sodium lactate (NaC:HsOr). Ka for lactic acid = 8.4 x l0a.Calculate the pH ofthe buffer.lQ,=1Vr{/,tCcrt{oJ = M *^f(a= ftA;?oo t4Z9= ttr 31^ _-? Cc."(sfl = t4,oo-* v,--.- / vr= wffizo*4al*j^rf /ru.-I = t, zi*),l,fiH"of"90.0 mL of the buffer to which 10.0 mL of 0.100 M NaOH has been added?*AzfuYt*-u + @t{a cr(rog: rt46(ct-lW,; U..osll oumal€* LauoL e2 6 w,n"LIArot7= l(o [s+ L",-al /Cu;] = x' c{ r t o-nre@= 1,t{x,o*3Anr: pHr 7 n'(pFk = 7"9qt?r"tyrd(l3ptr) 8. Whst is the molar solubility of iron flID hydroxid{Fe(O}Dr, K,o = l'6 x l0'3) in:a) purc dcionizcd water[=e(*.r,t\, : r 3t.O n :''\^d *=,0^# 'Z'nt+sSto4t3s a Jgr 30H7*trc+ u3rsJ/o "t3 sFe-Grt\s:LS=Fe_ (o4), a,> iF.T ,* 3 oet;o,oVSoda (o et(sP =.frtl l,igl=t5b,olootSi 6e,orooUg= o,olo-T+a s * 3gf3sCol Cz o4+\ stool/.=(-t3Bonus (5 pt!) Match the following q/pes of organic compounds in Column A with the stnrctural formulasgiven in Column B, Place the letter of the correct classification $pe from Column A in the parenthesisnextto the correct sfuctural formula in Column B. Place the corrcct forurula in Column CGive the corect IUPAC name for as many of the structural formulas as you can in Column DColumn Aa- Alkaneb. alkenoc. alkyned. oycloalkanee. aromaticf. alkylhalideg. alcoholh. etheri. aldehydej. ketonek. carboxylic acidl. estorm. aminen. amideo. amino acid. ColBr.L!)/, v.\4oF+cgH,o0Fu*Io"**\Col Drloc oA,oo-f rafy (u*brn'*,*ep'r'of;fo..-u**{ *3.(!L)olAroAzC-rl**noFro Po-a' (o rrri A e4.(w)..\/Y-HHca Al r)? ro P2?ce-t/14i*e-Fropt ( a,ynin q,\r\(,+ CE*, ooz ?evvtw-tor.'c- ,-., f-l(sp = Lr-=1t""ltGe=es\C=')=c/Z}S.3:o*h-viu,ertTr/r+b) 0.0100 M F{NOr)r solution?19z l,Elslo '"lu':----. 2. br5r-\\! = (,2 l'toVolume of 0.0t0M NaOHBonus #2 (l0pts) Given the titration curye above. -6 o-(lpt) a) Locate on the $aph the equivalence points.(3pts) d) Calculate Kar and K'z for the above diprotic acid.lo az ( '* *-^ *-i&(4pts) b) Calculate the average molarity of the dipmtic, agid represented in this titationcurve ":-ft; Ys::Izw*.!:g!;?: H*A6 u*r ffi-r/ t,t-O(Ot{-r".6t o -/1 = @,o17trf_r,g::l = l,oo*ro*^o =(2pts) c) Show on the graph aaovefuS€fofrfuould determine PKor and pK"2.'eu+,{,6ooro-3r-tP(.'=?t{% -- 2,6 oF*e: [-, tloep=


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CABRILLO CHEM 1B - exam#1

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