Analysis of Commercial Vitamin C Tablets. (Ascorbic acid content in one tablet)

Date: 25 Nov, 2004 Objective: 1. To warningize sodium thiosulphate for titration use. 2. To let on show up the soaking up of Vitamin C in the tablet. Theory: This investigate involves titration of redox chemical play offion. Redox pition means reduction and oxidation. In which oxidizing actor and minify gene are mixed and oxidize/reduce each other. sentiency losses electron(s) and increase in oxidation fleck when is oxidized, and evilness versa. In consecrate to find out niggardness of the ascorbic irate in the tablet, a redox reaction of it with tincture of single was done. piece of music iodine is an oxidizing agent and ascorbic irate is a reducing agent. The reaction forms dehydroascorbic dosage and iodide. Ascorbic sulphurous + I2 -> dehydroascorbic acid + 2 H+ + 2 I- However, iodine does not crock up in irrigate genuinely well. In this case, standard antecedent of green iodate(V) is used to dumb frame sedimentary iodine. Excess potassium iodide and dilute sulphuric acid is added to react with potassium iodate. KIO3 + 5 KI + 3 H2SO4 -> 3 I2 + 3 H2O + 3 K2SO4 Excess potassium iodide also helps turn iodine produced. I-(aq) + I2(s) I3-(aq) Iodine does not react with ascorbic acid too quickly, that is wherefore they fagnot be titrated directly. We use spare iodine solution to react with restrict vitamin C. Iodine remaining is then titrated with sodium thiosulphate, a reducing agent, thus number of mole of iodine reacted with vitamin C can be set out.

This technique is known as gage titration. atomic number 11 thiosulphate absorbs water in the atmosphere with while. Its concentration decreases with time as volume of water increases. In this case, standization of sodium thiosulphate is needed. Sodium thiosulphate is titrated with standard iodine solution, and the concentration of it can be found out. 2 Na2S2O3 + I2 -> Na2S4O6 + 2 NaI... if you see a -&gt it is an pay off arrow, unspoiled to remind you that.. ill give to fix it.. -_- If you want to transmit a full essay, order it on our website: Ordercustompaper.com

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