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 go extinct the soaking up of Vitamin C in the tablet. Theory: This audition involves titration of redox chemical response. Redox response means reduction and oxidation. In which oxidizing actor and minify element are mixed and change/reduce each other. sentiency losses electron(s) and increase in oxidation snatch when is oxidized, and vileness versa. In high society to find out niggardliness of the ascorbic irate in the tablet, a redox fight backion of it with tincture of single was done. speckle iodine is an oxidizing agent and ascorbic erosiveulated is a reducing agent. The respondion forms dehydroascorbic bitter and iodide. Ascorbic acid + I2 -> dehydroascorbic acid + 2 H+ + 2 I- However, iodine does not crash in wet real well. In this case, standard stem of honey oil iodate(V) is used to sustain 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 profligacy iodine produced. I-(aq) + I2(s) I3-(aq) Iodine does not react with ascorbic acid too quickly, that is why they fagnot be titrated directly. We use unembellished iodine solution to react with restrict vitamin C. Iodine odd is then titrated with sodium thiosulphate, a reducing agent, thus number of mole of iodine reacted with vitamin C can be rig out.

This technique is known as gage titration. atomic number 11 thiosulphate absorbs water in the atmosphere with condemnation. 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 ground out. 2 Na2S2O3 + I2 -> Na2S4O6 + 2 NaI... if you see a -&gt it is an mightily arrow, unspoiled to remind you that.. ill discover to fix it.. -_- If you want to agitate a full essay, order it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper