Redox Titration: : Analysis of Bleach lab report calculation I have lab report q

Question

Redox Titration: : Analysis of Bleach lab report calculation

I have lab report question.. One column is sufficient

For reference, lab procedures are here:

Question: (Just show me how to do one column)

ererar qura bleaches containing sodium hypochlorite are corrosive to the r skin and eyes. If you get any on your skin, wash it off immediately. PROCEDURE Step 1: Standardization of Sodium Thiosulfate Solution Prepare about 250 mL of an approximate 0.1M solution of sodium thiosulfate by diluting a 1.0 M ork 250 solution of sodium thiosulfate. 215

Explanation / Answer

Standarization of thiosulfate

1 mole of KIO3 gives 3 moles of I2

Trial 1,

moles KIO3 used = 0.001156 moles

moles I2 formed = 3 x 0.001156 = 0.003468 moles

1 mole of I2 reacts with 2 moles of Na2S2O3

moles Na2S2O3 reacted = 2 x 0.003468/1 = 0.006936 moles

Volume of thiosulfate used = 15.6 ml

Molarity of thiosulfate solution = 0.006936 moles/0.0156 L = 0.445 M

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Analysis of bleach solution

Trial 1,

1 mole of NaOCl (bleach) reacts with 2 moles of Na2S2O3

moles of Na2S2O3 used = 0.445 M x 0.0157 L = 0.0069865 moles

moles bleach reacted = 0.0069865/2 = 0.0035 moles

mass NaOCl present in titration mixture = 0.0035 moles x 74.44 g/mol = 0.26054 g

mass of commercial bleach solution = 1 ml x 1.084 g/ml = 1.084 g

percent NaOCl in bleach = 0.26054 g x 100/1.084 g = 24.03%

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