What is the reaction between sodium thiosulphate and KI? Beside the answer below, enter the page number where inorganic chemistry - Oxidation of sodium thiosulfate by iodine ... A standard reaction used to calibrate a solution of sodium thiosulphate is as follows: Acid and potassium iodide are added to a solution of potassium iodate getting the following reaction: KIO3 . If you add the starch solution too soon during the titration, the iodine will stick to the starch and won't react as expected with the thiosulfate, making the result unreliable. PDF Titration Methods for Salt Iodine Analysis - GitHub Pages PDF DETERMINATION OF THE PEROXIDE VALUE - ifrafragrance.org This is referred to as an iodometric titration. 2 S 2 O 3.You will use your results to determine the formula of the iodate salt, X. Redox titration using sodium thiosulphate, Na 2 S 2 O 3 (usually) as a reducing agent is known as iodometric titration since it is used specifically to titrate iodine. You will add excess aqueous potassium iodide, KI(aq), and aqueous acid to a measured portion of your solution to form aqueous iodine, I. Iodometry is one of the most important redox titration methods. Thiosulfate ions reacts with iodine Titrate until straw/yellow coloured Add strach indicator Solution turns blue-black Then, as the sodium thiosulfate solution is added during the titration, it reacts with the iodine and the brown colour will fade to a straw/yellow colour as the iodine is used up. Use the first flask for a trial run. Mrs Lucas explains the sodium thiosulfate and iodine titration theory and calculation.Apologies I didn't balance the hydrogen ions in the first equations!!!
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