This website uses cookies to ensure you have the best experience. Learn more

Chemistry Essay

1265 words - 5 pages

LAPORAN PRAKTIKUM KIMIA ELEKTROLISISJudul Praktikum : Elektrolisis Tujuan Praktikum : Mengetahui reaksi redoks yang terjadi pada anoda dan katoda pada proses elektrolisisVariabel :Variabel kontrol : Variabel yang dibuat sama.Contoh : Tabung reaksi, Ukuran tegangan listrik, Pipet tetes .Variabel Terikat : Variabel yang dibuat berbeda.Contoh : Larutan Na2SO4, larutan KI, indikator PP, Larutan universal ,Larutan amilum.Variabel Respon : Variabel yang merupakan hasil eksperimen.Contoh : Perubahan warna.Tanggal Praktikum : 18 November 2013 Kelas : XII IPA 6 Anggota Kelompok : Ahmad Roihan (01)Anindita Ratna (03)Anissa Hasna (04)Farandy Insan (06)Nilna Jauharotul K (11)Rifky Anindita (14)SMA NEGERI 1 LAWANGTAHUN AJARAN 2013/2014PENDAHULUAN a. Landasan TeoriElektrolisis adalah peristiwa penguraian atas suatu larutan elektrolit yang telah dilaliri oleh arus listrik searah. Sedangkan sel di mana terjadinya reaksi tersebut disebut sel elektrolisis. Sel elektrolisis terdiri dari larutan yang dapat menghantarkan listrik yang disebut elektrolit, dan sepasang elektroda yang dicelupkan dalam elektrolit (larutan atau leburan). Pada sel elektrolisis, reaksi kimia akan terjadi jika arus listrik dialirkan melalui larutan elektrolit, yaitu energi listrik (arus listrik) diubah menjadi energi kimia (reaksi redoks). Reaksi-reaksi elektrolisis bergantung pada potensial elektroda, konsentrasi, dan over potensial dari spesi yang terdapat dalam sel elektrolisis. Elektroda yang menerima elektron dari sumber arus listrik luar disebut Katoda, sedangkan elektroda yang mengalirkan elektron kembali ke sumber arus listrik luar disebut Anoda. Katoda adalah tempat terjadinya reaksi reduksi dan anoda adalah tempat terjadinya reaksi oksidasi. Katoda merupakan elektroda negatif karena menangkap elektron sedangkan anoda merupakan elektroda positif karena melepas elektron. Reaksi yang terjadi pada katoda dan anoda pada sel elektrolisis sama seperti pada sel volta, yaitu di katoda adalah tempat terjadinya reaksi reduksi dan di anoda adalah tempat terjadinya reaksi oksidasi. Akan tetapi, muatan elektronnya berbeda. Pada sel volta katoda bermuatan positif dan anoda bermuatan negatif, sedangkan pada sel elektrolisis katoda bermuatan negatif dan anoda bermuatan positif. Macam-macam elektrolisis : • Elektrolisis leburan elektrolit Dapat digunakan untuk menghantar ion-ion pada sel elektrolisis. Leburan elektrolit tanpa menggunakan air. Contohnya adalah NaCl. • Elektrolisis air Jika arus listrik dilewatkan melalui 2 elektroda dalam air murni, tidak terjadi elektrolisis. Tetapi, jika larutan CuSO4 / KNO3 ditambahkan air murni dengan konsentrasi rendah, akan terjadi elektrolisis dan dapat menghantarkan arus listrik. • Elektrolisis larutan elektrolit Reaksi yang terjadi tidak hanya melibatkan ion - ion dalam larutan saja,tetapi juga air. Contohnya adalah KI.Elektrolisis mempunyai banyak keguanaan di antaranya yaitu dapat memperoleh unsur-unsur logam, halogen, gas hidrogen dan gas...

Find Another Essay On Chemistry

chemistry Essay

1310 words - 5 pages Friedel-Crafts Acylation of Ferrocene: Acetylferrocene Last revision: 08/21/12 Adapted from JR Mohrig, CN Hammond, TC Morrill, and DC Neckers Experimental Organic Chemistry (A Balanced Approach: Macroscale and Microscale) 1999, WH Freeman, NY 189-194. Background This experiment has two purposes. The first is to explore Friedel-Crafts acylations of aromatic molecules, and the second is to develop an understanding of column chromatography as a

Agricultural Chemistry Essay

1025 words - 5 pages Agriculture is a very important part of human life. There are a lot of important things that connect to agriculture, Chemistry is one of them. With the use of chemistry people have been able to be more productive in agriculture. Everything from what we eat to what we wear to some degree has been perfected or enhanced though the use of chemistry in agriculture. Chemistry is used to prepare the soil, fertilize the plant, protect it and even

Organic Chemistry

1153 words - 5 pages A. In the late 1820's organic chemistry was the study of substances isolated from animals and plants that were thought to contain a "vital force." "Vitalism" was a theory that suggested that compounds found in living organisms were not constructable in laboratories. In those days, textbooks referred to the chemistry of such compounds as "animal chemistry" and "vegetable chemistry." It was a man named Fredrich Wohler who finally came along and

Hair Chemistry

1302 words - 6 pages When approaching the topic of hair chemistry, one may think about the question, where does hair come from? Saclike holes called follicles are located all over the human body. At the bottom of these follicles are a cluster of papilla responsible for the growth of hair. As the papilla, otherwise known as hair bulbs reproduce to make new hair cells, the old ones are pushed up towards the surface of the skin causing the hair to grow longer. This may

Chemistry Report

913 words - 4 pages acid chains linked to two of the alcohols of glycerol. However, they also contain a phosphate group, which has reacted with the third alcohol of glycerol. Phospholipids therefore have a polar head (hydrophilic) and a non-polar tail (hydrophobic), this property allows them to form bilayers. Works Cited "Chemistry for the IB Diploma." Http://www.pedagogics.ca/. Cambridge University Press, 2011. Web. 5 Jan. 2014.. "Daily Calorie Intake

Chemistry Coursework

2741 words - 11 pages is explained in our textbook Longmans GCSE chemistry:"If you increase the concentration of the reactants, the reaction becomes faster. Increasing the concentration increases the chances of particles hitting each other"PredictionAs the concentration increases the rate of reaction increases because of the scientific knowledge shown above.Safety· Lab coats are to be warn as spillages may occur· Safety glasses must be

Chemistry Investigation

3305 words - 13 pages Chemistry Investigation Investigation- To investigate the factors involved in the following reaction: Na2S2O3(aq) + 2HCl(aq) à 2NaCl(aq) + H2O(l) + SO2(aq) + S(s) PLANNING STAGE Variables: The following are variables which will affect my investigation. Temperature, Pressure, Concentration of Na2S2O3, Concentration of HCl, Stirring. The key variables which I'm going to investigate are

Chemistry

933 words - 4 pages On October 7th 2013, the Nobel Assembly at Karolinska Institutet awarded the 2013 Nobel Prize in Physiology or Medicine jointly to James E. Rothman, Randy W. Schekman and Thomas C. Sudhof for “their discoveries of machinery regulating vesicle traffic, a major transport system in our cells”. Before this research, knowledge about the vesicle transportation system that eukaryotic cells utilized was essentially limited to what could be observed

Chemistry

816 words - 4 pages 2. Experimental 2.1. General information and materials All of the materials for synthesis were purchased from commercial suppliers and used without further purification. All of the solvents used were analytical reagent grade. Thin-layer chromatography (TLC) was conducted using silica gel 60 F254 plates (Merck KGaA). Column chromatography was carried out using silica gel powder 60-120 mesh (Ranbaxy). IR spectra were recorded on a VERTEX 70 FT-IR

Chemistry

1747 words - 7 pages 1/13 = 65 User Defined 4 = C 5 = G 6 = C 1 intro CGCGBE intro CGCGBE 0 0 0 0 0 0 0 0 0 0 0 0 0 S-Gt 5 8 0 0 7 8 10 0 8 7 5 8 0 8 5 8 0 0 7 8 5 0 3 5 6 3 0 0 0 6 5 3 5 0 6 3 5 3 0 9 Section 1 (3) 0 0 5 7 5 3 0 6 5 3 5 0 3 1 0 1 3 5 0 6 3 0 3 0 0 0 0 0 13 10 0 0 8 7 0 10 7 8 10 0 8 7 0 8 7 10 8 0 7 10 6 0 6 6 6 0 5 8 0 5 7 8 Downloaded from MusicNotesLib.com Perfect notes and guitar tabs searcher user Машино

History of Chemistry

971 words - 4 pages Chemistry and technology are together and separate. Chemistry uses technology and technology uses chemistry. The history of chemistry and technology is long going back to the ancient times. Chemistry was used even by the oldest civilizations, like Egypt. It was really popular during the medieval times. Back then it was called Alchemy, which is turning metal into gold or even about the philosopher’s stone. As the years went by, Alchemy became a

Similar Essays

Chemistry Essay

925 words - 4 pages Robert Boyle is considered both the founder of modern chemistry and the greatest English scientist to live during the first thirty years of the existence of the Royal Society. He was not only a chemist and a physicist as we know him to be, but also an avid theologian, a philanthropist, an essayist, and a beginner in medicine. Born in Lismore, Ireland to Richard Boyle, first earl of Cork, and Katherine Fenton, his second wife, Boyle

Chemistry Essay

1694 words - 7 pages Textbook of Organic Medical and Pharmaceutical Chemistry. (12th ed., pp. 443-501). New York, NY: Lippincott Williams & Wilkins. 7. MacQuarrie, S. L. (2005). Design and synthesis of novel benzodiazepines. (Doctoral dissertation, University of Virginia). Retrieved from http://scholar.lib.vt.edu/theses/available/etd-12212005-223136/unrestricted/etd.pdf 8. Tintinalli, J., Stapczynski, J., Ma, O., Cline, D., Cydulka, R., & Meckler, G. (2011

Chemistry Essay 1712 Words

1712 words - 7 pages Chemistry Aim: I am trying to find out whether the equation 2CuCO3 ® Cu2O + 2CO2 + ½O2 or the equation CuCO3 ® CuO + CO2 is correct for the decomposition of copper carbonate. Introduction: This is my background research, this information may help me when I am trying to see which equation is correct. I have used the book Chemistry 1 by OCR as my reference. Relative

Chemistry Essay

2437 words - 10 pages of Pathology (2012). Benzodiazepines. Salt Lake City: ARUP LABORATORIES. 5. Rang, H., Dale, M., Ritter, J., & Flower, R. (2007). Rang and dale's pharmacology. (6th ed., pp. 536-542). Philadelphia, PA: Elsevier. 6. Beale, J., & Block, J. (2011). Wilson and Gisvold's Textbook of Organic Medical and Pharmaceutical Chemistry. (12th ed., pp. 443-501). New York, NY: Lippincott Williams & Wilkins. 7. MacQuarrie, S. L. (2005). Design and synthesis of