A 28.40-mL sample of liquid bleach (contains NaOCI; 74.44 g/mol) was diluted to a final volume of 1,899.8 mL. A 40.16-mL aliquot of the diluted sample was transferred into an Erlenmeyer flask and treated with excess KI to oxidize the OCI to Cl2 and producing l2. The liberated l2 intermediate as determined by titrating with 0.1357 M NazS203 and required 15.51 mL to reach a starch indicator endpoint. A blank correction of O.04 mL was required. Calculate the % w/v NaOCI in the original sample of bleach. Provide your answer to two places after the decimal point and without units. Reactions: 20C1- + 21- + 4H+ → I, + Cl2 + 2H20 I2 + 2S20- 21- + S40?-

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A 28.40-mL sample of liquid bleach (contains NaOCI; 74.44 g/mol) was diluted to a final volume of 1,899.8 mL. A 40.16-mL aliquot of the diluted sample was transferred into an
Erlenmeyer flask and treated with excess KI to oxidize the OCI to Cl2 and producing l2. The liberated l2 intermediate as determined by titrating with 0.1357 M Na,S203 and
required 15.51 mL to reach a starch indicator endpoint. A blank correction of 0.04 mL was required.
Calculate the % w/v NaOCI in the original sample of bleach. Provide your answer to two places after the decimal point and without units.
Reactions:
20C1- + 21- + 4H+
→ I2 + Cl2+ 2H2O
I2 + 2S2O
2-
→ 21- + SĄ0,-
6
Transcribed Image Text:A 28.40-mL sample of liquid bleach (contains NaOCI; 74.44 g/mol) was diluted to a final volume of 1,899.8 mL. A 40.16-mL aliquot of the diluted sample was transferred into an Erlenmeyer flask and treated with excess KI to oxidize the OCI to Cl2 and producing l2. The liberated l2 intermediate as determined by titrating with 0.1357 M Na,S203 and required 15.51 mL to reach a starch indicator endpoint. A blank correction of 0.04 mL was required. Calculate the % w/v NaOCI in the original sample of bleach. Provide your answer to two places after the decimal point and without units. Reactions: 20C1- + 21- + 4H+ → I2 + Cl2+ 2H2O I2 + 2S2O 2- → 21- + SĄ0,- 6
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