I. Judul : Elektrolisis
II. Tujuan : Menyelidiki elektrolisis larutan KI
Purpose : To research electrolisys of KI solution
III. Landasan Teori
Elektrolisis adalah proses penguraian suatu senyawan dengan pengaliran arus listrik yang melaluinya. Dalam elektrolisis terjadi perubahan energi listrik menjadi energi kimia.
Elektrolisis merupakan aliran listrik melalui dua elektroda yang dicelupkan pada elektrolit. Ada tiga macam materi yang dapat menerima reaksi redoks, yaitu : elektroda, anion atau kation dan air. Hal itu tergantung pada elektroda dan jenis larutan yang digunakan.
Basic Theory
Electrolisys is digestion procces of any compound with electic currents following that passes though. In electrolisys, alteration of electric energy into chemical energy occurs.
Electrolisys is electric current through two electrodes that immersed on electrolyte. There are three materials can happen redox reaction, there are : electrode, anion or kation and water. It depends on type of electrode and solution that are used.
IV. Alat dan Bahan
· Pipa U
· Tabung Reaksi
· Pipet
· Plat tetes
· Alat Penguji Elektrolit
· Larutan KI
· Indikator PP
· Nasi
· Larutan Amilum
· Tepung Kanji
· Gandum
Tools and Materials
o U Shape Tube
o Reaction Tube
o Pippete
o Pasteur Plate
o Electrolyte Test Tools
o KI Solution
o Indicator PP
o Cooked Rice
o Amilum Solution
o Starch Powder
o Wheat Flour
V. Langkah Kerja :
1. Mengambil larutan KI dan memasukkanya kedalam pipa U yang sudah terpasang pada alat elektrolisis
2. Memasukan elektroda , kemudian alirkan arus listrik
3. Mengamti perubahan yang terjadi pada elektroda
4. Mengambil sedikit larutan di sekitar katoda, tempatkan pada plat tetes.
5. Menambahkan 3 tetes indikator PP pada plat tetes
6. Mengamati perubahan warna yang terjadi
7. Mengambil sedikit larutan di sekitar anoda , tempatkan pada plat tetess
8. Menetesi larutan amilum (gandum) kedalam plat tetes
9. Mengamati perubahan yang terjadi
10. Mengulangi langkah 8-10 dengan bahan lain yang sudah disediakan (nasi dan tepung kanji)
Work Procedure
1. Taking KI solution and enter it into the pipe which is mounted on U electrolysis equipment
2. Insert the electrodes, electrical current and then circulate
3. Mengamti changes that occur at the electrodes
4. Take a bit of the solution around the cathode, place on plate drops.
5. PP add 3 drops of indicator on the plate drops
6. Observe the color changes that occur
7. Take a bit of the solution around the anode, place on plate tetess
8. Drops a solution of starch (wheat) into the plate drops
9. Observing the changes that occur
10. Repeat steps 8-10 with other materials that have been provided (rice and wheat starch)
VI. Hasil Pengamatan :
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VII. Analisis Data :
o Larutan di sekitar anoda ditambah larutan tepung (nasi, gandum, tepung kanji) : berubah warna menjadi biru kehitaman, hal ini membuktikan adanya I2
o Larutan di sekitar katoda di tambah indikator PP : berubah warna menjadi ungu kemerahan, hal inin membuktikan adanya basa / OH-
Data Analisys
o solution around the anode coupled solution of starch (rice, wheat, wheat starch): changed color to blue-black, this proves the existence of I2
o solution around the cathode in PP-added indicators: changed color to reddish purple, it proves the base inin / OH-
^ Question
a) Determine how many grams of Iodine would be obtained if 50cm of 1M KI electrolyzed completed ( Ar I : 127 )
b) How much Faraday current is needed
^ Answered :
.) V = 50 mL = 0,05 L
..) M = 1 M = 1 mol/L
^ Answered :
KI(aq) --> K+(aq) + I-(aq) | x2
Cathode : 2H2O(2) +2e- --> H2(q) + 2OH-(aq) | x1
Cathode : 2H2O(2) +
Anode : 2I-(aq) --> I2(aq) + 2e-
| _____________________________________________________+ 2KI(aq) + 2H2O(l) à 2K+ (aq) + 2OH- (aq) + H2(aq) + H2(aq) + I2(aq) |
.) V = 50 mL = 0,05 L
..) M = 1 M = 1 mol/L
a) .n KI = M . V
= 1 mol/L . 0,05 L
.n KI = 0,05
.n I2 thats happen = ½ x 0,05 mol = 0,025 mol
W I2 thats happen = 0,025 x ( 2 x 127 ) = 6,35 grams
b) W I2 = e . F
6,35 = 2 x 127 F
2
F = 6,35 x 2
2 x 127
F = 0,05
è Ternyata Kuat Arusnya equivalent dengan mol yang ter-elektrolisis
VIII. Kesimpulan
· Elektrolisis larutan Ki ialah penguraian senyawa KI dengan pengaliran arus listrik yang melaluinya.
· Dari percobaan di atas terbukti bahwa disekitar katoda terdapat gelembung gas H2 dan dengan menggunakan KOH
· Dalam elektrolisis terjadi perubahan energi listrik menjadi kimia
· Sedangkan dengan menggunakan uji amilum, nasi, gandum, tepung kanji, terbukti bahwa di sekitar anoda terdapat larutan I2
Conclution
· • Electrolysis is the decomposition of compound solution of KI Ki with the drainage of electric current through it.
· • From the above experiments proved that there are around the cathode and bubbles of H2 gas by using KOH
· From the experiment proved that around cathode there are bubbles of H2 and with using indicator PP, the solution around cathode clear is KOH solutions
· Meanwhile with using test amilum, cooked-rice, wheatflour, starch powder, thet around anode there are I2 solutions.
IX. Daftar Pustaka
Bibliography
Ø Susilowati, Endang. 2011. Theory and Application of Chemistry 3 .Solo : Tiga Serangkai. Pustaka mandiri
Ø Kuswati dkk. 2007. Sains KIMIA 3 SMA/MA. Jakarta: bumi Aksara. BA Printing
Ø www.google.co.id
ATTACHMENT :
ATTACHMENT :
sumber : mas ALE al Gozhali (12a2)
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