Last chem lab ever

Last chem lab ever - Natalie Eng Suli Liu Tuesday 2:50pm Redox Titration Analysis of Bleach Introduction The purpose of this lab was to determine

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Natalie Eng Tuesday 2:50pm Suli Liu March 27, 2008 Redox Titration: Analysis of Bleach Introduction: The purpose of this lab was to determine the concentration of the potassium iodate standard and determine the percentage of sodium hypochlorite in bleach. In order to do this we standardized an unknown sodium thiosulfate solution and then use this information to determine the concentration of hypochlorite ion in a commercial bleaching sample. Chemical Responsibilities: Wear goggles at all times and do not inhale chemicals. Sodium thiosulfate is slightly toxic by ingestion and a body tissue irritant. Potassium iodate is an oxidizer moderately toxic and a tissue irritant. Sulfuric acid is corrosive and can cause skin burns. Commercial bleach is a corrosive liquid, causes skin burns, moderately toxic by ingestion and inhalation. Sample Calculations: For determining the concentration of potassium iodate: Moles KIO 3 : .01*.025= 2.5*10^-4 B)Moles Na 2 S 2 O 3 : 2.5*10^-4*6=.0015 mole C)Volume used: total volume used/1000
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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