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558F2DD0ECC39/5571F90F49795991698EB196) Please download to view (https://docslide.com.br/download/link/vitamin-c-558f2dd0ecc39) Praktikum analisa kuantitatif vitamin C dalam sample dilakukan dengan menggunakan metode titrasi iodimetri (titrasi langsung) hal ini berdasarkan bahwa sifat vitamin C dapat bereaksi dengan iodin Penentuan ini dilakukan dengan menggunakan larutan I2 0,01 N sebagai titrant. Sample yang dipergunakan saat praktikum adalah minuman sari buah dalam
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kemasan yang banyak dijual di pasaran dengan merk dagang ABC mango juice. Dalam kemasan minuman disebutkan bahwa dalam minuman tersebut kaya akan vitamin C. Vitamin C atau asam bersifat larut dalam air dan sedikit larut dalam aseton atau alkohol yang mempunyai berat molekul rendah. Akan tetapi vitamin C sukar larut dalam pelarut organic yang pada umumnya dapat melarutkan lemak. Titrasi iodimetri dilakukan dengan menggunakan amilum sebagai indikator. Seperti yang sudah diketahui bahwa prinsip dari titrasi iodimetri adalah reduksi analat oleh I2 menjadi I-. ARed + I2 Aoks + IIod
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merupakan oksidator yang tidak terlalu kuat, sehingga hanya zat-zat yang merupakan reduktor yang cukup kuat yang dapat
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dititrasi. Sehingga penerapannya tidak terlalu luas, salah satu penerapan titrasi dengan metode iodimetri adalah pada
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penentuan bilangan iod minyak dan lemak juga vitamin C. Proses pengujian untuk sample sari buah dilakukan dengan 1 kali pengenceran dan dilakukan 2 kali pengujian (duplo). Sample yang ditimbang saat praktikum adalah 5,038 g, sample ditimbang langsung dalam labu ukur dan diencerkan dengan menggunakan aquadest sampai tanda batas. Setelah sample dikocok sampai homogen, selanjutnya sample dipipet sebanyak 25 mL dan dimasukan dalam erlenmeyer, kemudian ditambahkan amilum 1% sebagai indikator sebanyak 1 mL setelah itu dititrasi dengan menggunakan I2 0,01 N. Proses titrasi dilakukan sampai larutan dalam erlenmeyer berubah warna menjadi biru, warna biru yang dihasilkan merupakan iod-
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amilum yang menandakan bahwa proses titrasi telah mencapai titik akhir, indikator yang dipergunakan dalam analisa vitamin C dengan metode iodimetri adalah larutan amilum. Reaksi yang terjadi adalah : Berdasarkan hasil praktikum volume titrasi pada sample minuman sari buah ABC adalah 1,3 dan 1,4 mL. Sehingga berdasarkan perhitungan menggunakan
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0,0943%. Hasil tersebut tidak dapat dibandingkan dengan standar dari SNI 01-3719-1995 tentang sari buah, hal ini
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dikarenakan pada standar SNI tersebut tidak ada parameter tentang kadar vitamin C dalam sari buah. H. KESIMPULAN
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rumus maka kadar vitamin C dalam sample ABC mango juice adalah 0,091% dan 0,098% dan nilai rata-ratanya adalah
Pengujian kadar vitamin C dalam sample dilakukan dengan menggunakan metode iodimetri, yaitu oksidasi analat oleh I2 sehingga I- tereduksi menjadi ion iodida. Pengujian dilakukan 2 kali (duplo). Berdasarkan praktikum dan hasil perhitungan, maka dapat diketahui bahwa pada pengenceran 100 mL kadar dari vitamin C dalam sample ABC juice mango adalah 0,091% dan 0,098%. Dan rata-rata kadar vitamin C dalam sample adalah 0,0943%. Dan hasil analisa tersebut tidak dapat dibandingkan dengan SNI 01-3719-1995 tentang sari buah, hal ini dikarenakan pada standar SNI tersebut tidak ada
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parameter tentang kadar vitamin C dalam sari buah. Redox Reaction of Ascorbic Acid using IO3? [b]1. The problem[/b]
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Equation 1 - IO3- (aq) + 6 H+ (aq) + 5 I- (aq) -> 3 I2 (aq) + 3 H20 The iodine formed will react with the ascorbic acid.
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Equation 2 - C6H8O6 + I 2 -> C6H6O6 + 2 I- (aq) + 2 H+ (aq) The goal is to determine the ascorbic acid concentration (mg/mL) in a Vitamin C solution. A 10mL sample Vitamin C solution was pipetted into an Erlenmeyer flask, to which water, .5 g KI(s), 5 mL of 1M HCl solution, and 1 mL 1% starch solution was mixed thoroughly. Titration began with .0137M KIO3. To reach the endpoint indicated by the blue color of the idoine-starch complex, required 18.96 mL IO3- solution. [b]2. Relevant equations[/b] a. calculate the number of moles IO3- required for titration. b. Calculate the number of moles of I2 (as I3-) produced in the reaction mixture. c. Calculate the number of moles of ascorbic acid (176.14 g/mole) present in the
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10-mL aliquot. Calculate the molarity (M) of the ascorbic acid solution. d. Calculate the mg/mL of ascorbic acid in the solution. 3. I am assuming the easiest way to find the number of moles I03- required for titration is to take the 18.96 mL, convert it to L and multiply it by Molarity. But the Molarity I have known is for KIO3 (.0137M) I didn't want to run this
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overall equation for the reaction between vitamin c and iodate: 3 C6H8O6 + 3 I2(aq) ---> 3 C6H6O6 + 6 H+(aq) + 6 I-(aq)
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(IO3)-(aq) + 5 I (aq) + 6 H+ ---> 3 I2(s) + 3 H2O(l) -------------------------------------3 C6H8O6 + (IO3)-(aq) ---> 3 C6H6O6 + I-(aq) +
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calculation without further clarification as to whether or not this is correct. Thanks! y 2 months ago First, write down an
3 H2O(l) Where the first equation was multiplied by 3 to equal the number of iodine molecules on both sides because all I2(aq) we make has to be completely oxidized by vitamin C in the reaction. Okay, now we can begin answering the questions: 2a) (0.0137 M KIO3) x (0.01896 L KIO3) = 2.60x10^-4 moles KIO3. Since for every mole of KIO3 you make 1 mole of (IO3)-, the number of moles of (IO3)- is exactly the same. 2b) (0.0137 M KIO3) x (0.01896 L KIO3) x [(3 moles I2)/(1 mole KIO3)] = 7.79x10^-4 moles I2 2c) (0.0137 M KIO3) x (0.01896 L KIO3) x [(3 moles C6H8O6)/(1 mole KIO3)] = 7.79x10^-4 moles C6H8O6 The concentration is given by: C = (7.79x10^-4 moles)/(0.01000 L) = 7.79x10^-2 M or 77.9 mM C6H8O6 2d) Re-write the concentration from moles/L to moles/mL and then convert to mg/mL: [(7.79x10^-2 moles
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C6H8O6)/(1000 mL)] x [(176120 mg)/(1 mole)] = 13.7 mg/mL Cheers. (https://docslide.com.br/documents/vitamin-c-558f2dd0ecc39.html)
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Praktikum analisa kuantitatif vitamin C dalam sample dilakukan dengan menggunakan metode titrasi iodimetri (titrasi langsung) hal ini berdasarkan bahwa sifat vitamin C dapat…
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