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tl ul te l! Jf L v u l l a G. C. 1-5 Limiting Reagent Study 37 G.C. 1-5: LABORATORY REPORT ...... _ _f ~c_ Date ____ _ Lab partners ' names: TA ' s Name: ----------------------- -------------------------- YOU MUST SHOW ALL YOUR CALCULATIONS TO RECEIVE CREDIT FOR THEM! Proper use of significant figures and units is part of the grading. P:i · t I: Test-tube Test-tube Test-tube Test-tube Test-tube Test-tube ForCoCl 2 #1 #2 #3 #4 #5 #6 Concentration 0, lo M Volume delivered ~l~l',\l 1~,c,JML -, I J~l'--iL \() ,cfML (rnL) ?..-0 fl,l"\L ~ctt"'1L Moles of CoCl 2 ~,Oit'{10) 16 1 -1\ -~ (..~)(1;'1"10\ -H ,~1011111 'i cOfrf- lo "1•1 ,. s~ ~,/) "'"' t,()Q ;( lo..,., Test-tube Test-tube Test-tube Test-tube Test-tube Test-tube For N a 2 CO 3 #1 #2 #3 #4 #5 #6 Concentration D ~\ DM Volume delivered \ 3.D~r'\1- l~10fML l' \,t>tll\c.._ qi~\'\£_ '•~i"'\L S,~1'1-\L ( mL ) -3 -3 .., -~ -1-\. ) _, Moles of Na 2 CO 3 • ::Oi-.lo M,1\ \,~'°I {1;,holal LI lli'P 1'1.dl q I~}.$) ,ul 1 , S,Q~c) ... · " " f.-10 Volume Test-tube Test-tube Test-tube Test-tube Test-tube Test-tube Measurements #1 #2 #3 #4 #5 #6 1M. cl I Height of precipi- ,J,_ C.!V) {, .5 (W\ 7, 2 c"1 &..De'"'- 7,"5C.lv\ · 6 ,Sc..,_ tate formed (cm) Color of supema- tant liquid observed [t(..11<-V C.,\e..,( (\e"l.'f ,- ''('. "'- y r-- (k-<-r f 1'\I\ I{ Color of precipitate ~\ul f of p le., observed fv <rl t- fv<Pte (J tV\ r-.. p ,-Y! Calculations: Carry out calculations for your data only. Coc.1~- .. 1 • Co, -;:) l 1. .o 0 ) C o. oo 1 ) :.- l ;1-. 16 - 4 -\ \ . ?io~ 10 M 0 '- 'i • ( 0 , I<> J ( ? ) l \ - \.I ),Cu O,oc.1 1 : ) ,_ 10 \ ~.{ti.'())( 1.Co)(o . oo$- L -'i · l ~lo ½ ,, (,,0. 10') ( L .o o ') (o.oo \ ):. r - ~l · ""'I-le 1 {o . [o) (7,S<JJ (o.c,ot ): 7_ 5 il-r<,1-~ ~\ (o,to)(lo•a<.!.)[o,oc,1):. \ i1,16-) \, ?-D '{..\6~/Y\o\

38 G. C. 1-S limiting Reagent Study Predictions of Limiting Reagent: Tiii s section can be completed while waiting for the precipitate to settle. Test-tube Test-tube Test-tube Test-tube Test-tube #1 #2 #3 #4 #5 Ex cess Co 2+ or l. - ;i,,~ :t. - ~/Yt 'J. - co /- pre se nt ? C.J) ... " o (__i> Co ) -... ...... Moles of Co 2 + in / / I / ~/4 e xc ess Moles of CO ~ 2 - in 1,Cbi ltl'lol _, tJrn ex ce ss °' -1 ,\1\\ \0 "'6\ " ·· $\ l'lbl ~,06~\b Md-. Theoretical yield ~ .~~1ci'I 1-\ ,O(> (.1c,~ • '( 1.So~toi~ -~ b,oow, of CoC0 3 (moles) :i. .(P~\6 ~I. f"\-&\, ""' N. ,-,Al M6l Part 11: Verification of Limiting Reagent Observations Test-tube Test-tube Test-tube Test-tube Test-tube of precipitate #1 #2 #3 #4 #5 formation Reaction of super- natant liquid with MR_ N~ ~t Na3P04 Reaction of super- ~\;\---L .,J 'r..;\--t., ~:\-t.. \,J \.. :l- <1.. natant liquid with '('e \- r $~ 'P \- 'f P \- ~l BaCl 2 -~ \,)fl f..-\o--1 - ;:) ,C>D )(.lD : -, -'"l :,. \ 1.\0 {. \D - '-\,o<::> -4-\b 2 I\ i\., '\ . ol> 1- \1, -'I - b. t,oi-\1>-~ : 1 \oo Ho- V"'- o \.. -~ ) , Co (-. ( 6 ,('V\_ 6 \ s, ~. Test-tube #6 ,9--4 {!.6 r;. oo i, io·"'J Mo\ I _q ~. 6£,-t \ ~l. Test-tube #6 ~o ,~\l.. ~9-\- kJl J

G. C. 1-5 Limiting Reagent Study 39 G.C. 1-5: DISCUSSIO N QUESTIO N S 1. Compare the theoretical yield of the CoCO 3 pr ecipitate e xpect ed with th e height s/volume of precipitate. What would explain any anomalie s you may find? Did any of your ob servations about color of the precipitate and liquid giv e suppotting e vid e nc e? ~$ :\:netoe\:C'\l i C,\ i \'\c{t c>. Sd I \:\)L h, , ~~ \.- ;yu, (et\St;S. ' "'" Vb\v\"'\C. S\:C ½ fS t ¼ t ~°'~' • i cl J iV\l ({o.St5 i"'-C lb \ l>< j o~~ fcoM- b\i)L f-o p;V\~ 2. Were your predictions for which ion wa s in e xc ess ve rified by Part 11 of th e experiment? E xplain . ~e> j h;~ \~ O( C -w '> .e. ~\.\.r Sv ~dV\.l\ic:tV\t- c v,;~ hc tc!. . r)D ie «d<D V) I \lf\ +vice) I -.s w ; \\,\ N o..) ~V c l. & t'.:>D h> ½ L 5 ¾ k, \-\A.d 3. How would you detennine the point at which a reagent from part I becomes the limiting reagent for the reaction? Doe s the molar ratio have an effect on which reagent is the limiting reagent? Ex p lain . I w o12\0: ,,.\ t V\tJ ;'{ ± "'-t C~t~:c~l t..>:t~ ttss IV\6l!S , vt t\.i, l ~<-<>r : o~ w~ : c.. ¼ \.JOvl6 b(. t\.\c, \:l',.•d:"j {!~ 9 {V\t, 1 {-\l l-- Ml21~ r fttf:o btc) C\ n. eUtd l)(C"'"' sc. t~l SM 4 \l,~i Mole. ~\f\\NI'\~ w o..>\ 1-:>l.. l:\'>t}:Vl J 4. What reagent would you predict to be in excess for reacting 7 .50 mL of a 0.10 M BaC1 2 solution with 7 .50 mL of 0.10 M KIO 3 solution? Explain. Hint: Balance the equation first. \l/\ l. e -La'>5 , · s ~Io) -\- ¼ .C. t;\'V\.:L · V\j feGl.Ij~+ ,5 r\9c.. 1 i. ,'S l V"\,v\ \>ctl I ?.. t"D r ';l_ M2>\S 6 103 I ';D w~ Cct.cl\ 6tl\ r rt: "l,.ct- L rito Le 1£> t,c0 (.. : '"s t 1.\.-c.. s. 11"\."f. l u si. '{_ Vvt,C, cf\ t SHOW YOUR WORK BELOW: ~(5) 1. 5 ""L 0 . \ C, M <> I C O ' 7 s j'f\ C, l \Is yv\ c) \ l ~"ld '>- 1- ----- J..~1-0J - J

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