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ANALYSIS OF BLEACH BY THIOSULFATE TITRATION

ANALYSIS OF BLEACH BY THIOSULFATE TITRATION By Dr Richard Walding, griffith University, Australia Downloaded from Email: The determination of free chlorine in BLEACH is possible by a redox TITRATION . The most common and successful method for use in high schools involves taking the sample of BLEACH converting the hypochlorite ion (ClO-) to iodine (I2) by the addition of KI and then titrating the iodine with standardized sodium THIOSULFATE solution. Step 1: Preparing a standard solution of potassium iodate (KIO3) Procedure: To make an approximately M solution of potassium iodate, accurately weigh approximately g KIO3 (dried at 120 C for at least 2 hours prior to weighing) and make up to 100 mL in a volumetric flask. Sample results and calculations: Mass of KIO3 = g C (KIO3) = n/V = m/M/V = = M Step 2: Prepare a solution of approximately M Na2S2O3 solution Weigh out approximately g of sodium THIOSULFATE pentahydrate crystals into a 250 mL volumetric flask and add approximately sodium carbonate.

ANALYSIS OF BLEACH BY THIOSULFATE TITRATION By Dr Richard Walding, Griffith University, Australia Downloaded from seniorchem.com/eei.html Email: richard@walding.com

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  Analysis, Titrations, Bleach, Griffith, Analysis of bleach by thiosulfate titration, Thiosulfate

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