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1. A 25.00 mL sample of a liquid bleach was diluted to 1000 mL in a volumetric flask. A 25 mL portion of the diluted sample was transferred by pipet into an Erlenmeyer flask and treated with excess KI, reducing the OCI to Cl", and producing I,. The liberated I, was determined by titrating with 0.09892 mol/L Na,S,O,, requiring 8.96 mL to reach the starch indicator end point. Report the %w/v NaOCl in the sample of bleach.

1. A 25.00 mL sample of a liquid bleach was diluted to 1000 mL in a volumetric flask. A 25 mL portion of the diluted sample was transferred by pipet into an Erlenmeyer flask and treated with excess KI, reducing the OCI to Cl", and producing I,. The liberated I, was determined by titrating with 0.09892 mol/L Na,S,O,, requiring 8.96 mL to reach the starch indicator end point. Report the %w/v NaOCl in the sample of bleach.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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4GHD l 09:25 …… VPN 4G 72 ... 文档预览 1/2 Homework8: Choose one of following question as your homework 8 1. A 25.00 mL sample of a liquid bleach was diluted to 1000 mL in a volumetric flask. A 25 mL portion of the diluted sample was transferred by pipet into an Erlenmeyer flask and treated with excess KI, reducing the OCI to CI", and producing I,. The liberated I, was determined by titrating with 0.09892 mol/L Na,S,0,, requiring 8.96 mL to reach the starch indicator end point. Report the %w/v NaOCl in the sample of bleach. 2. The amount of ascorbic acid, C,H,O,, in orange juice was determined by oxidizing the ascorbic acid to dehydroascorbic acid, C,H,O,, with a known excess of I,, and back titrating the excess I, with Na,S,0,. A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of excess 0.01023 mol/L I,. After the oxidation was complete, 13.82 mL of 0.07203 mol/L Na,S,O, was needed to reach the starch indicator end point. Report the concentration of ascorbic acid in milligrams per 100 mL.
Transcribed Image Text:4GHD l 09:25 …… VPN 4G 72 ... 文档预览 1/2 Homework8: Choose one of following question as your homework 8 1. A 25.00 mL sample of a liquid bleach was diluted to 1000 mL in a volumetric flask. A 25 mL portion of the diluted sample was transferred by pipet into an Erlenmeyer flask and treated with excess KI, reducing the OCI to CI", and producing I,. The liberated I, was determined by titrating with 0.09892 mol/L Na,S,0,, requiring 8.96 mL to reach the starch indicator end point. Report the %w/v NaOCl in the sample of bleach. 2. The amount of ascorbic acid, C,H,O,, in orange juice was determined by oxidizing the ascorbic acid to dehydroascorbic acid, C,H,O,, with a known excess of I,, and back titrating the excess I, with Na,S,0,. A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of excess 0.01023 mol/L I,. After the oxidation was complete, 13.82 mL of 0.07203 mol/L Na,S,O, was needed to reach the starch indicator end point. Report the concentration of ascorbic acid in milligrams per 100 mL.
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