PRAKTIKUM IX PENETAPAN KADAR GLUKOSE TITRASI REDOKS (IODIMETRI) TITRASI KEMBALI
Hari/Tanggal : Nama
: Anis Syakiratur Rizki
NIM
: P07134012 00
I.
DASAR TEORI
Titrasi r!"#ks a"ala$ r!aksi %!ngga&ungan suatu s!nya'a "is!rtai "!ngan %!nam&a %!nam&a$an $an "an %!ngura %!ngurangan ngan &il#ks( &il#ks( A"a A"a &!&!ra &!&!ra%a %a m!t#"! m!t#"! yang yang "igunaka "igunakan n "ala "alam m
titr titras asii
r!"# r!"#ks ks yaitu aitu m!t# m!t#"! "! i#" i#"#m!t #m!tri ri))
i#"i i#"im! m!tr tri) i)
&r#m &r#m#m #m!t !tri ri "an "an
%!rmangan#m!tri( I#"im!t I#"im!tri ri a"ala$ a"ala$ r!aksi r!aksi k!s!tim& k!s!tim&anga angan n "ari i#"ium i#"ium "an i#"i"!( i#"i"!( R!aksi R!aksi ini &iasa "is!&ut "!ngan r!aksi "!ngan *ara langsung yakni zat %!r!"uksi "ititrasi langsung #l!$ i#"ium "an m!ru%akan %!n!ntuan atau %!n!ta%an kuantitati+ yang "asar %!n!ntuannya a"ala$ ,umla$ I 2 yang &!r!aksi "!ngan sam%!l atau t!r&!ntuk "ari "ari $asil $asil r!ak r!aksi si antar antara a sam%! sam%!ll "!nga "!ngan n i#n i#n i#"i" i#"i"!( !( M!t#"! M!t#"! titrasi titrasi i#"#m!tri i#"#m!tri langsung langsung -ka"ang.ka"ang -ka"ang.ka"ang "inamakan "inamakan iodimetri m!nga*u k!%a"a titrasi "!ngan suatu larutan i#" stan"ar( M!t#"! titrasi i#"#m!tri tak langsung -ka"ang.ka"ang "inamakan iodometri ) ) a"laa$ &!rk!naan "!ngan titrasi "ari i#" yang "i&!&askan "alam r!aksi kimia -n"!r'##") 1( Istila Istila$ $ #ksi" #ksi"as asii m!nga m!nga*u *u %a"a %a"a s!tia s!tia% % %!ru& %!ru&a$a a$an n kimia kimia "iman "imana a t!r,a" t!r,a"ii k!naikan &ilangan #ksi"asi) s!"angkan r!"uksi "igunakan untuk s!tia% %!nurunan &ilangan #ksi"asi(!rarti %r#s!s #ksi"asi "is!rtai $ilangnya !l!ktr#n s!"angkan r!"uksi r!"uksi m!m%!r# m!m%!r#l!$ l!$ !l!ktr#n !l!ktr#n(( 5ksi"a 5ksi"at#r t#r a"ala$ a"ala$ s!nya'a s!nya'a "i mana at#m at#m yang yang t!rkan"ung m!ngalami %!nurunan &ilangan #ksi"asi( S!&aliknya %a"a r!"ukt#r) at#m yang t!rkan"ung m!ngalami k!naikan &ilangan #ksi"asi( 5ksi"asi.r!"uksi 1
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$arus s!lalu &!rlangsung &!rsama "an saling m!nk#m%!nsasi satu sama lain( Istila$ #ksi"at#r r!"ukt#r m!nga*u k!%a"a suatu s!nya'a) ti"ak k!%a"a at#mnya sa,a -6$#%kar) 2003( 5ksi"at#r l!&i$ ,arang "it!ntukan "i&an"ingkan r!"ukt#r( Namun "!mikian) #ksi"at#r "a%at "it!ntukan "!ngan r!"ukt#r( R!"ukt#r yang lazim "i%akai untuk %!n!ntuan #ksi"at#r a"ala$ kalium i#"i"a) i#n titanium-III) i#n &!si-II) "an i#n ana"ium ana"ium-II -II(( 8ara titrasi titrasi r!"#ks r!"#ks yang yang m!ngguna m!nggunakan kan larutan larutan i#"ium i#"ium s!&agai s!&agai %!ntit!r "is!&ut i#"im!tri(-Riai) 1( 9ala 9alam m
%r#s %r#s!s !s anal analit itik ik)) i#"i i#"ium um "igu "iguna naka kan n s!&a s!&aga gaii %!r! %!r!ak aksi si #ksi #ksi"a "asi si
-i#"im!t -i#"im!tri( ri( R!lati+ R!lati+ &!&!ra% &!&!ra%a a zat m!ru%aka m!ru%akan n %!r!aks %!r!aksii r!"uksi r!"uksi yang yang *uku% *uku% kuat kuat untuk "ititrasi "ititrasi s!*ara langsung "!ngan "!ngan i#"ium( Maka ,umla$ %!n!ntuan %!n!ntuan i#"im!trik a"ala$ s!"ikit( Akan t!ta%i &anyak %!r!aksi #ksi"asi *uku% kuat untuk &!r!aksi s!m%urna "!ngan i#n i#"i"a) "an a"a &anyak %!nggunaan %r#s!s i#"#m!trik( Suat Suatu u k!l! k!l!&i &i$a $an n i#n i#n i#"i i#"i"a "a "ita "itam& m&a$ a$ka kan n k!%a k!%a"a "a %!r! %!r!ak aksi si #ksi #ksi"a "asi si yang yang "it!ntukan) "!ngan %!m&!&asan i#"ium) yang k!mu"ian "ititrasi "!ngan larutan natrium ti#sul+at( R!aksi antara i#"ium "an ti#sul+at &!rlangsung s!*ara s!m%urna -n"!r'##") 1( I#"ium $anya s!"ikit larut "alam air -0)00134 m#l %!r lit!r %a"a 2 08) t!ta%i agak larut "alam "alam larutan yang m!ngan"ung m!ngan"ung i#n i#"i"a( i#"i"a( arutan i#"ium i#"ium stan"ar "a%at "i&uat "!ngan m!nim&ang langsung i#"ium murni "an %!ng!n*!ran "alam t#l t#l #lum!tr #lum!trik( ik( I#"ium) I#"ium) "imurnik "imurnikan an "!ngan "!ngan su&limasi su&limasi "an "itam&a "itam&a$ka $kan n %a"a suatu suatu larut larutan an 6I %!ka %!kat) t) yang yang "itim& "itim&an ang g "!nga "!ngan n t!lit t!litii s!&!l s!&!lum um "an "an s!su" s!su"a$ a$ %!n!m&a$an %!n!m&a$an i#"ium( Akan Akan t!ta%i &iasanya larutan "istan"arisasikan "istan"arisasikan t!r$a"a% t!r$a"a% suatu stan"ar %rim!r) As 253 yang %aling &iasa "igunakan( -n"!r'##") 1( ;arna larutan 0)1000 N i#"ium a"ala$ *uku% kuat s!$ingga i#"ium "a%at &!k!r,a s!&agai in"ikat#rnya s!n"iri( I#"ium ,uga m!m&!ri 'arna ungu atau m!ra$
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t!r$a"a% i#"ium( 6!%!kaan l!&i$ &!sar "alam larutan yang s!"ikit asam "ari%a"a larutan n!tral "an l!&i$ &!sar "!ngan a"anya i#n i#"i"a -n"!r'##") 1( A -R!"ukt#r -R!"ukt#r < I 2
A -T!r#ksi"asi < 2I −
In"ikat#r In"ikat#r a"ala$ s!nya'a #rganik yang &ila "i#ksi"asi "i#ksi"asi "!ngan atau "ir!"uksi "ir!"uksi akan akan m!ngal m!ngalami ami %!ru %!ru&a$ &a$an an 'arna 'arna(( P!r&! P!r&!"a "aan an 'arna 'arna "ari "ari &!nt &!ntuk uk t!r!"u t!r!"uks ksii "!ngan &!ntuk t!r#ksi"asi $arus ta,am) s!$ingga %!nggunaannya %!nggunaannya "a%at s!s!"ikit mungkin mungkin untuk untuk m!nguran m!ngurangi gi k!sala$ k!sala$an an titrasi( titrasi( In"ikat In"ikat#r #r yang yang "igunak "igunakan an "alam "alam titrasi r!"#ks a"ala$ in"ikat#r Amilum( =luk#sa =luk#sa - 8H125) &!r &!rat at m#l! m#l!kul kul 10( 10(1 1 a"ala$ a"ala$ $!ks#sa $!ks#sa>m#n#sakari"a >m#n#sakari"a yang
m!ngan"ung
!nam
at#m
karn(
=luk#sa
m!r m!ru%akan
al"!$i"a
-m!ngan"ung gugus .8H5( ima karn "an satu #ksig!nnya #ksig!nnya m!m&!ntuk m!m&!ntuk *in*in yang "is!&ut ?*in*in %iran#sa?) &!ntuk %aling sta&il untuk al"#sa al"#sa &!rkan &!rkan !nam( 9alam 9alam *in*in *in*in ini) tia% karn t!rikat t!rikat %a"a gugus gugus sam%ing $i"r#ksil $i"r#ksil "an "an $i"r#g!n k!*uali at#m k!limanya) yang t!rikat %a"a at#m karn k!!nam "i luar *in*in) m!m&!ntuk suatu gugus 8H 25H( Struktur *in*in ini &!ra"a "alam k!s!tim&angan "!ngan &!ntuk yang l!&i$ r!akti+) yang %r#%#rsinya 0(002@ %a"a %H %H 7( 7( II.
TUJUAN
ntuk m!ng!ta$ui ka"ar larutan in+us gluk#s! %a"a *airan in+us m!nggunakan m!t#"! titrasi r!"uksi #ksi"asi -#"im!tri titrasi k!m&ali( III.
PRINSIP KERJA
Sam%!l larutan =luk#s! "itam&a$kan "!ngan Natrium 6arnat 10@ k!mu"ian "imasuk "imasukkan kan %a"a ruang ruang g!la% g!la% atau atau "i%anas "i%anaskan kan m!nggun m!nggunakan akan 'at!r&a 'at!r&at$ t$ "an "itam&a$kan "itam&a$kan larutan H8l 10@( 9ititrasi "!ngan larutan Natrium T$i#sul+at T$i#sul+at sam%ai 'arna larutan kuning %u*at lalu tam&a$kan tam&a$kan in"ikat#r amilum "an "ititrasi k!m&ali( Titik Titik ak$ir ak$ir titrasi titrasi "itan"a "itan"aii "!ngan "!ngan a"anya a"anya %!ru&a$a %!ru&a$an n 'arna 'arna larutan larutan in"ikat in"ikat#r #r
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II( P6 =luk#s!
IV.
ALAT LAT-ALAT LAT DAN DAN REA REAG GENSIA A. Alatlat-A Alat lat 1( N!ra*a N!ra*a analitik analitik m!r*k m!r*k Sart# Sart#rius rius 2( ur!t ur!t #lum #lum! ! 2)00 2)00 ml "an "an stati stati+ + 3( a&u a&u !rl!nm! !rl!nm!y!r y!r #lum #lum! ! 20 ml "an "an tutu% tutu% asa$( asa$( 4( =!las =!las &!k!r &!k!r #lum! #lum! 1000 1000 ml ml "an "an 100 ml ( =!las =!las ukur ukur #lum #lum! ! 2 2 ml ( Pi%!t Pi%!t g#n" g#n"#k #k #lum #lum! ! 10)0 10)0 ml 2)0 ml 7( Pi%!t i%!t +ill +ill!r !r ( 8#r#ng ( =!las !las arl# arl#,i ,i 10(Alumun 10( Alumunium ium #il! 11( 11( #t#l s!m%r#t s!m%r#t 12(Tissu!
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B. Reag Reagen ens sa a 1( aru aruta tan n =luk =luk#s #s! ! 1@ 2( I#"i I#"ium um 0)10 0)1000 00 N 3( 6aliu alium m I#" I#"i" i"a a 4( Ars! Ars!n n Tri Tri#k #ksi" si"a a -As -As 253 ( Na5H 10@ ( Asam sam Su Sul+at l+at -H2S54 1@ 7( Natri Natrium um 6ar 6arna natt 10@ 10@ ( Asam Asam 6l#r 6l#ri" i"a a 10@ 10@ ( In"i In"ika kat# t#rr Ami Amilu lum m 1@ 10(ABua"!st V.
!ARA KERJ A A. Pe"#$atan Pe"#$atan I%&$" I%&$" ' N se#an*a+ se#an*a+ ,'' "l 1( 9itim&an 9itim&ang g kurang kurang l!&i$ l!&i$ )4 gram kristal kristal I 2( 2( 9imasukk 9imasukkan an k! "alam "alam g!las g!las &!k! &!k!rr #lum! #lum! 00 ml 3( 9itam&a$ 9itam&a$kan kan gram gram 6alium 6alium I#"i"a I#"i"a "an s!"ikit s!"ikit aBua" aBua"!st( !st( 4( 9ia"uk 9ia"uk atau "i*am%ur "i*am%ur $ingga $ingga $#m#g!n $#m#g!n -&isa -&isa m!ngguna m!nggunakan kan $#t %lat! %lat! "an
magn!tik stirr!r( ( 9itam&a$kan 9itam&a$kan "!ngan "!ngan aBua"!st aBua"!st sam%ai sam%ai &atas &atas skala skala 00 00 ml( ( 9imasukk 9imasukkan an k! "alam t#l t#l r!ag!n *#klat *#klat &!rtutu &!rtutu% % "an "i*am%ur "i*am%ur "!ngan "!ngan &aik( 7( 9i&!ri 9i&!ri !tik!t !tik!t "an tangg tanggal al %!m&ua %!m&uatan tan(( B. Pe"#$atan Pe"#$atan la$tan la$tan Nat$" Nat$" Ka#%nat Ka#%nat se#an*a+ se#an*a+ '' '' "l 1( 9itim&an 9itim&ang g kurang kurang l!&i$ 20 gram gram &u&uk Natriu Natrium m 6arnat( 6arnat( 2( 9imasukk 9imasukkan an k! "alam g!las g!las &!k!r #lum! #lum! 20 lit!r yang su"a su"a "iisi t!rl!&i$ t!rl!&i$
"a$ulu "!ngan s!"ikit aBua"!st( 3( 9ia"uk 9ia"uk atau atau "i*am% "i*am%ur ur $ingga $ingga $#m#g!n $#m#g!n(( 4( 9itam&a$kan 9itam&a$kan "!ngan "!ngan aBua"!st aBua"!st sam%ai sam%ai &atas &atas skala skala 200 200 ml( !. Stan&asas Stan&asas La$tan La$tan I%&$" I%&$" '''' N &engan &engan Ba+$ P"e P"e La$tan Asen Asen T%+s&a 1( 9i%i% 9i%i%!t !t 10)0 ml larut larutan an Ars! Ars!n n Tri#k ri#ksi si"a "a k!mu"ian masukkan k! "alam
la&u !rl!nm!y!r #lum! 20 ml( - Be !ae/$ll Use 0lle 11et %nl* 2( 9itam&a$kan 9itam&a$kan 2 2 ml aBua"!st aBua"!st "an "an 1 ml in"ikat#r in"ikat#r amilum amilum 1@( 3( 9ititrasi 9ititrasi "!ngan "!ngan larutan larutan I#"ium I#"ium 0)1000 0)1000 N sam%ai sam%ai larutan larutan &!ru&a$ &!ru&a$ 'arna m!n,a"i &iru( 4( Hitung Hitung n#rmali n#rmalitas tas larutan larutan I#"i I#"ium um t!rs!&ut t!rs!&ut((
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2( 9imas 9imasuk ukkan kan k! "alam "alam la&u Crl!n Crl!nm!y m!y!r !r "an "an "itam& "itam&a$ a$kan kan larutan larutan Asam Asam Sul+at 1@( 3( 9itam&a$kan 9itam&a$kan 1 ml in"ikat#r in"ikat#r amilum 1@ "an "an "ititrasi "ititrasi "!ngan "!ngan larutan Natrium T$i#sul+at sam%ai "!ngan !n" %#int larutan &!r'arna &iru( 4( 9i$itung n#rmalitas n#rmalitas larutan larutan Natrium T$i#sul+at T$i#sul+at t!rs!&ut( t!rs!&ut( E. Peneta1 Peneta1an an Ka&a Ka&a Gl$+%s Gl$+%se e 1( 9i%i%!t 9i%i%!t s!*ar s!*ara a s!ksama s!ksama 10)0 10)0 ml larutan larutan =luk# =luk#s!( s!( 2( 9imas 9imasukk ukkan an k! "alam "alam la&u la&u Crl!n Crl!nm!y m!y!r !r #lum! #lum! 20 ml yang m!milik m!milikii
tutu% asa$( 3( 9ita 9itam& m&a$ a$ka kan n 3)0 3)0 ml laru laruta tan n i#"i i#"ium um 0)10 0)1000 00 N "an 10 ml laru laruta tan n Natrium 6arnat( 4( 9i%an 9i%anas aska kan n "i atas 'at!r 'at!r &at$ s!lama s!lama 20 m!nit m!nit atau atau l!tak l!takkan kan %a"a %a"a ruang g!la%( ( 9itam&a$ 9itam&a$kan kan 1 ml larutan larutan H8 1@( ( 9ititr 9ititras asii "!ng "!ngan an larut larutan an Natr Natrium ium T$i#s T$i#sul+ ul+at at 0)100 0)1000 0 N sam%a sam%aii larut larutan an &!r'arna kuning %u*at( 7( 9itam&a$ 9itam&a$kan kan in"ikat in"ikat#r #r amilum amilum s!&anyak s!&anyak 1 ml "an titrasi titrasi k!m&ali k!m&ali $ingga $ingga 'arna &iru larutan $ilang( ( Hitung Hitung ka"ar ka"ar larutan larutan =luk#s! =luk#s! -8 H125(H25( VI.
RUMUS PER3ITUNGAN . Massa Massa Nat$ Nat$" " Ka#%na Ka#%natt '4 '4 ; D E-ml F 10 100 6!t! 6!t!ran ranga gan: n: ' : massa massa &u&uk &u&uk Natr Natrium ium 6ar 6arna natt yang yang akan akan "iti "itim&a m&ang ng E : E#lum! %!ng!n*!ran . N%"al N%"alta tas s Ba+$ Ba+$ Se+$n& Se+$n&e e N 1 × V 1 1
N2 D
Vt
6!t! 6!t!ran ranga gan: n: N1 N1 E1 N2 Et
: N#rma N#rmalit litas as larut larutan an &aku &aku %ri %rim!r m!r : E# E#lum! lum! lar larut utan an &aku &aku %rim! %rim!rr : N#rma N#rmalit litas as &aku &aku s!kun s!kun"! "!rr : E#lum! tititrasi
5. Pene Peneta ta1a 1an n Ka& Ka&a a mgrek I 2
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mgr!k I2 mgr!k Na2853 6!t!r !t!ran anga gan: n: Et C N E VII.
D E I2 F N I2 D Et Na 2853 F N Na2853 : E# E#lum! lum! titr titras asii : N#m N#m#r #r at# at#m r!la r!lati ti+ + : N#rmalitas : E#lum! lum! gluk#s k#s! "i%i%! i%!t
DAT DATA PER!OBAA BAAN
(1 9ata titrasi stan"arisasi I#"ium N# 1 2 3
E#lum! lum! % "i%i "i%i%! %!tt -ml -ml P!m& P!m&a* a*aa aan n &ur &ur!t !t -ml -ml E#lum! lum! Titra itrasi si -ml -ml 10)0 10)10 00)00−10)10 10)0 10)20 10)20−20)40 10)0 10)00 10)00−10)00
(2 9ata titrasi stan"arisasi Natrium T$i#sul+at N# 1 2 3
E#lum! lum! % "i%i "i%i%! %!tt -ml -ml P!m& P!m&a* a*aa aan n &ur &ur!t !t -ml -ml E#lum! lum! Titra itrasi si -ml -ml 10)0 )0 00)00−0)0 10)0 )70 0)0−1)0 10)0 )70 1)0−2)20
(3 9ata titrasi %!n!ta%an ka"ar N# 1 2 3
E#lum! lum! % "i%i "i%i%! %!tt -ml -ml P!m& P!m&a* a*aa aan n &ur &ur!t !t -ml -ml E#lum! lum! Titra itrasi si -ml -ml 3)0 3)20 00)00−03)20 3)0 3)70 03)20−0)0 3)0 3)0 0)0−10)40
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D 0)00 N 2
N2
D
1 × V 1 1 N 1 Vt 2 0,1000 × 10,0
D
10,20
D 0)00 N 3
N2
D
1 × V 1 1 N 1 Vt 3 0,1000 × 10,0
D
10,00
D 0)1000 N Data 1 + Data 2 + Data 3
N2 rata rata.r .rat ata a D
3 0,0990 + 0,0980 + 0,1000
D
3
D 0)00 N
B. N%"al N%"alta tas s Nat$" Nat$" T2%s$l/ T2%s$l/at at
9ik!ta$ui:
9itanya:
N1
D 0)00 N
E1
D 10)0 ml
Et1
D )0 ml)
N2 Na S 5
D G(
Et2 D )70 ml)
Et3 D )70 ml
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D 0)1021 N 3
N2
D
1 × V 1 1 N 1 Vt 3 0,0990 × 10,0
D
9,70
D 0)1021 N Data 1 + Data 2 + Data 3
N2 rata rata.r .rat ata a D
3 0,1010 + 0,1021 + 0,1021
D
3
D 0)1017 N !. Ka&a Ka&a Ta# Ta#le lett
9ik!ta$ui:
Et 1
D 3)20 ml)
N I2
D 0)00 N
Et2 D 3)70 3)70 ml) Et3 D 3)0 ml
N2 rat rata. a.ra rata ta D 0)10 0)1017 17 N C E 9itanya:
a'a&: a'a&:
D D 10)0 ml
@ gluk#s! D G(
1 @ gluk#s!
(( mgrek I 2 −mgrek Na 2 S 2 O 3 ) ) ×BE× 100 D V ( ( ml ) × 1000
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2 @ gluk#s! gluk#s!
(( mgrek I 2 −mgrek Na 2 S 2 O 3 ) ) ×BE× 100 D V ( ( ml ) × 1000 35,0 × N I 2 2
¿
Vt Na 2 S 2 O 3 × N Na Na 2 S 2 O 3
−(¿ −(¿ ) ¿ ¿ ¿ ¿
D
D
( ( 35,00 × 0,0990 )−( 3,70 × 0,1017 ) ) × 99 × 100 10,0 × 10000
D 0)30 @
3 @ gluk#s! gluk#s!
D
( ( mgrek I 2 −mgrek Na 2 S 2 O 3 ) )×BE× 100 V ( ( ml ) × 1000 35,0 × N I 2 2
¿
Vt Na 2 S 2 O 3 × N Na Na 2 S 2 O 3
−(¿ −(¿ ) ¿ ¿ ¿ ¿
D
D
( ( 35,00 × 0,0990 )−( 3,50 × 0,1017 ) ) × 90 × 100
D 0)30 @
10,0 × 10000
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Hasil %!r*#&aan m!nun,ukkan m!nun,ukkan &a$'a $asil n#rmalitas larutan I#"ium "an Natrium T$i#sul+at yang "i%!r#l!$ a"ala$ 0)00 N "an 0)1017( 6!mu"ian) ka"ar gluk#s! a"ala$ 0)30@( B. Kes Kes"1 "1$l $lan an 9ari $asil %!r*#&aan "a%at "ik!ta$ui &a$'a titrasi "ilakukan "ua
kali yaitu s!&!lum %!nam&a$an in"ikat#r 'arna larutan &!ru&a$ "ari m!ra$ tua m!n,a"i kuning ,!rami "an s!t!la$ %!nam&a$an in"ikat#r %a"a %a"a saat saat end point titrat titrat &!ru&a$ 'arna "ari &iru m!n,a"i &!ning( 9ari $asil %!r$itungan "a%at "ik!ta$ui &a$'a ka"ar gluk#s! "alam in+us s!&!narnya a"ala$ 0)30@( a"i) $asil %!n!ta%an ka"ar gluk#s! ti"ak s!suai "!ngan !tik!t) yaitu ka"ar gluk#s! l!&i$ k!*il "ari !tik!t) yaitu 0)30@ J 1@( X.
PEMB A3AS AN
Pa"a Pa"a %rak %rakti tiku kum m
in ini
%!n %!n!t !ta% a%a an
ka" ka"ar ar glu* glu*#s #s! !
"il "ilak akuk ukan an "!ng "!ngan an
m!nggunakan m!t#"! titrasi r!"#ks -I#"im!tri yaitu "!ngan titrasi k!m&ali( 9alam titras titrasii t!rs! t!rs!&ut &ut $arus $arus m!m&u m!m&uat at larut larutan an &aku &aku %rim! %rim!rr "an "an &aku &aku s!kun s!kun"!r "!rny nya( a( arutan yang akan "it!ntukan ka"arnya -&aku s!kun"!r a"ala$ larutan I#"ium "an Natrium T$i#sul+at( arutan Ars!n Tri#ksi"a(Stan"arisasi "alam titrasi t!rs!&ut "ilakukan "ilakukan "ua kali yaitu titrasi %!rtama "ilakukan a"ala$ titrasi stan"arisasi i#"ium "an titrasi titrasi k!"ua k!"ua a"ala$ a"ala$ titrasi titrasi stan"ar stan"arisas isasii larutan larutan Natrium Natrium T$i#su T$i#sul+at( l+at( 9alam 9alam %!n!ta% %!n!ta%an an ka"ar ka"ar "ilakuka "ilakukan n titrasi titrasi k!m&ali( k!m&ali( S!&!lum S!&!lum m!lakuk m!lakukan an titrasi) titrasi) larutan larutan yang akan "ititrasi "i%anaskan t!rl!&i$ "a$ulu "i atas 'at!r&at$ atau "i&iarkan
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s!&!narnya a"ala$ 0)30@( a"i) $asil %!n!ta%an ka"ar ti"ak s!suai "!ngan !tik!t yaitu 0)30@J1@( Kakt#r.+akt#r yang "a%at m!ny!&a&kan $asil ti"ak s!gni+ikan a"ala$: 1( 2(
6!sa 6!sala$ la$an an %a"a %a"a saat saat %!lar %!laruta utan( n( 6!sa 6!sala la$a $an n "ala "alam m titr titras asi) i) "i anta antara rany nya a a"al a"ala$ a$ +a*t +a*t#r #r k!*! k!*!rm rmat atan an "ala "alam m %!m&u %!m&uat atan an larut larutan) an) &aik &aik m!lal m!lalui ui %!ng %!ng!n* !n*!ra !ran n mau%u mau%un n saat saat %!ni %!nitra trasia sian n
3(
XI. XI.
s!$ingga m!ngaki&atkan $asil "ata ak$ir %a"a sam%!l ti"ak akurat( Pr#s Pr#s!s !s tit titra rasi si t!r t!rla lalu lu lam lam&a &at( t(
!AT !ATATAN DA DAN DOKU DOKUME MENT NTA ASI A. !atatan 1( Tim&an m&anga gan n yang ang "igu "iguna naka kan n $aru $arus s "i%! "i%!r$ r$at atik ikan an %#si %#sisi si "an "an l!ta l!tak k
%!n!m%atannya kar!na "a%at m!m%!ngaru$i $asil %!nim&angan( 2( Pa"a Pa"a saat m!nim&an m!nim&ang g %!rlu m!m%!r$a m!m%!r$atika tikan n zat yang akan akan "itim&ang "itim&ang "an 'a"a$ yang akan "igunakan %a"a saat %!nim&angan misalnya) a%a&ila zat yang akan "itim&ang a"ala$ zat yang $ygr#sk#%is maka 'a"a$ yang "igunakan a"ala$ t#l tim&ang(
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Pena"#a2an In&+at% A"l$"
La$tan Ttat Setela2 Ttas