PERCOBAAN I ANALISIS MULTI KOMPONEN CAMPURAN KOBALT DAN KROM
I.
Tujuan Percobaan
Untuk Untuk menget mengetahui ahui analisi analisiss multi multi kompone komponen n campur campuran an kobalt kobalt dan krom
II.
Dasar Teori
Unsur kimia kobalt juga merupakan suatu unsur dengan sifat rapuh sedikit keras dan mengandung metal serta kaya sifat magnetis yang serupa setrik setrika. a. Unsur Unsur kimia kimia kobalt kobalt adalah adalah batu batu bintan bintang. g. Kobalt Kobalt adalah adalah suatu suatu isotop yang diproduksi menggunakan suatu sumber sinar (radiasi energi ting tinggi gi). ). Kobal Kobaltt meru merupa pakan kan sala salah h satu satu logam logam unsu unsurr tran transi sisi si dengan dengan konfigurasi elektron 3d7 yang dapat membentuk kompleks. Kobalt yang rela relati tiff stab stabil il bera berada da seba sebagai gai Co(I Co(II) I) atau ataupun pun Co(I Co(III II). ). amu amun n dalam dalam senya!a sederhana Co" Co(II) lebih stabil dari Co(III). Ion # ion Co$% dan dan ion ion terh terhid idra rasi si &Co( &Co('$ '$) )* *$% $% stab stabil il di air. air. Komp Komple leks ks koba kobalt lt dimungkinkan dapat terbentuk dengan berbagai macam ligan" diantaranya sulfadia+in sulfadia+in dan sulfamera+in sulfamera+in.. ,ulfadia+in ,ulfadia+in dan sulfamera+i sulfamera+in n merupakan merupakan ligan yang sering digunakan untuk obat antibakteri. Keduanya merupakan turu turuna nan n dari dari sulf sulfon onam amid id yang yang peng penggu guna naan anny nyaa seca secara ra luas luas untu untuk k pengobatan infeksi yang disebabkan oleh o leh bakteri -rampositif dan -ram negatif tertentu" beberapa jamur" dan proto+oa (,is!andono" /001 ). Kromium adalah $/ paling banyak unsur dalam kerak bumi dengan konsent konsentras rasii ratar ratarata ata /22 ppm. ppm. ,enya!a ,enya!a Kromiu Kromium m terdapa terdapatt di dalam dalam lingkun lingkungan gan"" karena karena erosi erosi dari dari batuan batuan yang yang mengand mengandung ung kromiu kromium m dan dapat didistribusika didistribusikan n oleh letusan gunung berapi. entang entang konsentrasi konsentrasi dalam tanah adalah antara / dan 3222 mg 4 kg" dalam air laut 1522 6g 4 lite liter" r" dan dan di sunga ungaii dan dan dana danau u $ 6g 4 lite literr deng dengan an 1"$ 1"$ mg 4 lite liter. r. 'ubungan antara Cr (III) dan Cr (I) sangat tergantung pada p' dan oksidatif sifat lokasi" tetapi dalam banyak kasus" Cr (III) adalah spesies
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dominan" meskipun di beberapa daerah di tanah air dapat mengandung sampai 30 6g dari total kromium dari 32 6g yang hadir sebagai Cr (I). Unsur Unsur Cr dalam dalam tubuh tubuh dapat dapat membent membentuk uk senya!a senya!a komple komplek k yang yang disebut glucose tolerance factor (-89). :olekul tersebut terlibat dalam interaksi antara insulin dan sel reseptor yang memungkinkan banyaknya pasokan glukosa ke dalam sel (;inder" /00$). /00 $). 9ungsi utama Cr adalah untuk meningkatkan akti
(-lu (-luco cose se 8ole 8olera ranc nce) e)..
=efi =efisi sien ensi si yang ang
lebi lebih h
para parah h
akan akan
mengakibatkan pertumbuhan terganggu" hiperglikemia (hyperglycemia)" glikosaria (glycosaria) dan meningkatnya kadar kolesterol dalam serum. ,truktur ,truktur -89 tersusun tersusun dari komplek antara Cr
3%
dengan $ molekul asam
niko nikoti tinat nat dan 3 asam asam amin amino o yang yang terk terkan andun dung g dalam dalam glut glutat atio ion n yait yaitu u glutamat" glisin dan sistein (;inder" /00$). Kromium secara biologis aktif sebagai sebagai kompone komponen n dari dari -89 yang yang meningka meningkatka tkan n sensit sensitifi ifitas tas sel dan jaringan terhadap penggunaan penggun aan glukosa dan insulin" tanpa adanya kromium -89 tidak aktif (Under!ood" $22/). ,umber alami -89 adalah kapang" organ hati" merica" keju dan daging (>inarno" $22$) Kromium dan ion kobalt menyerap cahaya tampak meskipun ma?imal absorbansi absorbansi mereka cukup baik dipisahkan. dipisahkan. =engan mengukur mengukur absorbansi absorbansi pada dua panjang gelombang yang berbeda dari larutan yang mengandung ion" adalah mungkin untuk secara bersamaan menentukan konsentrasi dari setiap setiapion ion dalam dalam laruta larutan. n. ,ebuah ,ebuah laruta larutan n tidak tidak diketa diketahui hui mengand mengandung ung spesies dianalisis menggunakan spektrofotometer (,aputri" $2/2). ,pektrofotom ,pektrofotometri etri merupakan suatu metoda analisa analisa yang didasarkan didasarkan pada pengukuran serapan sinar monokromatis oleh suatu lajur larutan ber!arna pada panjang gelombamg spesifik dengan menggunakan
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yangleb yanglebar ar terdir terdirii atas atas panjang panjang gelomba gelombang. ng. Aanjang Aanjang gelomb gelombang ang yang yang dika dikait itkan kanden denga gan n cahay cahayaa tampa tampak k itu itu mamp mampu u memp mempeng engar aruhi uhi sela selaput put pelangi mata manusia dan karenanya menimbulkan kesan subyektif akan ketampakan (
(B)
larut arutan an
dide didefi fini nisi sika kan n
sebag ebagai ai
log
nega negattif
daritransm daritransmitansi itansi (8) dari larutan. Bbsorbansi Bbsorbansi berbanding lurus dengan panjang jalan melalui larutan dan konsentrasi dari spesies menyerap. B Dbc dimana D Brtinya" B Dbc mana D absorpti
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$. :engguna :enggunakan kan kur
analisis
kuantitatif
komponen
tunggal.
Arinsip
pelaksanaannya adalah mencari absorban atau beda absorban tiaptiap kimponen yang memberikan korelasi yang linier terhadap konsentrasi" sehingga akan dapat dihitung masingmasing kadar campuran +at tersebut secara serentak atau salah satu komponen dalam campurannya dengan kompone komponen n lainny lainnya. a. Arinsi Arinsip p analisi analisiss multi multi kompone komponen n dengan dengan metode metode ,pektrofotom ,pektrofotometri etri Uis adalah kaliberasi tiaptiap komponen dengan memakai larutan standar. =ikenal ada dua macam larutan standar yaitu laruta larutan n standar standar murni murni dan laruta larutan n standar standar campur campuran. an. ;aruta ;arutan n standar standar campuran teknik pembuatan dan dampak kesalahannya sudah jelas lebih rumit (8im =osen 9armasi" $227).
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III.
Alat an Ba!an a." a." Alat Alat
/) ,pektro ,pektronik nik $2 $) -elas -elas ukur ukur /2 ml ml 3) ;abu ;abu uku ukur r G) Ku
#.$
Ba!an
/) ;arutan ;arutan krom (III) (III) nitrat nitrat 2"21 2"21 : $) ;arutan ;arutan kobalt (II) (II) nitrat nitrat 2"/55 2"/55 : 3) aua auade dess
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I%.
Proseur &erja
/)
Keadi Keaditi tifa fan n abs absor orban banss lar larut utan an Cr 3% dan Co%$ a. :enyia :enyiapka pkan n laru larutan tan H
2"2$ : Cr %3
2"271 : Co%$
;arutan campuran Cr %3 % Co%$ yang mengandung 2"2$ : Cr %3 dan 2"271 : Co%$
b. :engukur absorban ketiga larutan pada panjang gelombang G22 # $2 nm" tiap kenaikan kenaikan $2 nm dengan air sebagai blanko. :embuat satu kertas grafik spektrum absorpsi masing # masing dari ketiga larutan berdasarkan data yang diperoleh kemudian menjumlahkan spektrum absorpsi Cr %3 dan Co%$ " memeriksa keaditifannya. $)
ilai k a.
:enentu :enentukan kan nila nilaii atau atau letak letak punca puncak k maksi maksimum mum spekt spektrum rum Cr Cr %3 dan Co%$ berdasarkan grafik.
b.
:enyiapkan larutan Cr %3 dan Co%$ dengan konsentrasi H Cr %3 H 2"2/J 2"2$J 2"23J 2"2GJ 2"21 : Co%$ H 2"2/55J 2"237J 2"21GJ 2"271$ : :engukur absorban masing # masing pada Cr Cr dan Co " sehingga dapat membuat G kur
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:enghi :enghitung tung nilai nilai k masing masing # masing masing panjang panjang gelomb gelombang ang tersebut.
%.
'asil (e (en)a*at *atan a an (e (e*ba *ba!asan %."
'asil Pen)a*atan %."." %."." Ke Keai aiti+ ti+an an absor absorban bansi si laruta larutan n Cr #,--$ --$ M an an Co$,--/0 M Absorbansi 1A2 #,
$,
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Sa*(el
A 16*a&s Cr#, 7 3" 3"0 n* n*2
A 16*a&s Co$, 70"0 n*2
2"2/ :
2"20
2"/23
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2"23 :
2"G$$
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2"2G :
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2"$57
b. Nila Nilaii &la &laru ruta tan n Co Co$, #,
A 16*a&s Co$,
Sa*(el
A 16*a&s Cr 7 3"0 n*2
2"2/55 :
2"/G/
2"/$0
2"237 :
2"/35
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2"21G :
2"/25
2"32G
2"271$ :
2"/75
2"353
%.$Analisa Data %.$." Keaiti+an absorbans absorbans larutan Cr #,an Co$, a. Cr#,
70"0 n*2
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b. Co$,
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c. Ca*(uran Cr Cr ,# an Co,$
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Per!itun)an Re)resi 9
:
9:
9$
2"2 /
2"20
2"2220
2"222/
2"2 $
2"GG
2"220$5
2"222G
2"2 3
2"G$$
2"2/$
2"2220
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2"G05$ %
(2"2$ # 2"23) -#3-4
2"G05$ %
(2"23 # 2"23) -354$
2"G05$ %
(2"2G # 2"23) -;0;3
2"G05$ %
(2"21 # 2"23) -4"#
Kur8a Cr,# (aa 6 Cr CrSetela! Re)resi
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b. Kur8a Cr,# (aa 6 Co Co Kur8a Cr,# (aa 6 Co CoSebelu*Re)resi
Per!itun)an Re)resi 9
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/"1G
yi
ȳ % b (?i # L ) 2"$/25% /"1G (2"2/ # 2"23) 2"/522 2"$/25 % /"1G /"1G (2"2$ # 2"23) 2"23) 2"/01G 2"$/25% 2"$/2 5% /"1G (2"23 # 2"23) 2"$/25 2"$/25% 2"$/2 5% /"1G (2"2G # 2"23) 2"$$$ 2"$/25% 2"$/2 5% /"1G (2"21 # 2"23) 2"$G/ Kur8a Cr,# (aa 6 Co CoSetela! Re)resi
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&
$"323 $ "323 ? 8g M $"323 ? /"1G #03
c. Kur8a Co$, (aa 6 Cr Cr Kur8a Co$, (aa 6 Cr Cr Sebelu* Re)resi
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L
b
2"2G7
ȳ
2"/G/$1
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-3#-4 &
$"323 $ "323 ? 8g M $"323 ? 2"G325 -5$55
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L
2"2G7
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2"$11
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konsentrasi. Ofek yang sama kadangkadang diamati dalam larutan yang mengandung mengandung konsentrasi konsentrasi tinggi elektrolit elektrolit.. Kedekatan Kedekatan ion (selain faktor lain lain sepert sepertite itempe mperat ratur) ur) menguba mengubah h absorpt absorpti
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'asil 'asil yang yang di dapat dapatkan kan dari dari penguk pengukur uran an abso absorb rbans ansii laru laruta tan n dima dimana na panj panjan ang g gelo gelomb mban ang g maks maksim imum um ion ion Cr 3% pada ada G/1 nm sedangka sedangkan n ion Co%$ mempuny mempunyai ai serapan serapan maksim maksimum um pada panjang panjang gelo gelomb mban ang g 1/1 1/1 nm. nm. Keti Ketika ka kedu keduaa laru laruta tan n dica dicamp mpur urka kan n panj panjan ang g
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