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8. The concentration of hypochlorite (OCl) in liquid bleach can be determined by a back-titration method in which the bleach first oxidizes I to I3 reduced to Cl according to while OCl- is ocr +31-+ 2H+ â Cl-+1 + H20 Sodium thiosulfate Na2S203(158.10 g/mol) is then added in excess to reduce the l3 produced in reaction (I) back to I via 25,02-+13-31-+5,0 - The excess S20is then back-titrated with electrically-generated I at the anode 31-â 1 + 2e-]. A 5.00 mL sample of liquid bleach was diluted to 250.0 mL in a volumetric flask. A 5.00 mL aliquot of the diluted bleach was transferred to an electrolysis cell containing a KI electrolyte, which produced I^ via reaction (I). A 10.00 mL aliquot of 0.0421 M Na2S203 was added to reduce all the l3 via reaction (II) leaving an excess ofS2037. This excess S203 was titrated by electrically- generated I3, which required 162.5 s at 49.57 mA to reach the equivalence point. Calculate the weight percent of NaOCl (74.44 g/mol) in the bleach sample (density 1.01 g/mL).
8. The concentration of hypochlorite (OCl) in liquid bleach can be determined by a back-titration method in which the bleach first oxidizes I to I3 reduced to Cl according to while OCl- is ocr +31-+ 2H+ â Cl-+1 + H20 Sodium thiosulfate Na2S203(158.10 g/mol) is then added in excess to reduce the l3 produced in reaction (I) back to I via 25,02-+13-31-+5,0 - The excess S20is then back-titrated with electrically-generated I at the anode 31-â 1 + 2e-]. A 5.00 mL sample of liquid bleach was diluted to 250.0 mL in a volumetric flask. A 5.00 mL aliquot of the diluted bleach was transferred to an electrolysis cell containing a KI electrolyte, which produced I^ via reaction (I). A 10.00 mL aliquot of 0.0421 M Na2S203 was added to reduce all the l3 via reaction (II) leaving an excess ofS2037. This excess S203 was titrated by electrically- generated I3, which required 162.5 s at 49.57 mA to reach the equivalence point. Calculate the weight percent of NaOCl (74.44 g/mol) in the bleach sample (density 1.01 g/mL).
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Irving HeathcoteLv2
11 Apr 2019
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