Preparation and Standardization of 0.1 N lodine Solution Preparation 1. Dissolve 14 g of iodine in a solution of 36 g of potassium iodide in 100 ml of water 2. Add 3 drops of hydrochloric acid and dilute to 1000 ml Standardization 1. Weigh 150 mg of arsenic trioxide (As203) and dissolve in 20 ml of 1 N sodium hydroxide by warming it necessary 2. Dilute with 40 ml of water, add 2 drops of methyl orange TS and follow with diluted hydrochloric acid until the yellow color is changed to pink 3. Add 2 grams of sodium bicarbonate, dilute with 50 ml off water, and add 3 ml of starch TS 4. Slowly titrate the lodine solution into the analyte until a permanent blue color is produced. 5. Calculate the normality. "Volume of iodine which produced the permanent blue color: 30.2 ml Standardization: REACTION Arsenic Trioxide Volume of iodine Normality As2O3 + 6NaOH → 2Na3AsO3 + 3H₂O Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ + H₂O DATA 0.150 g 30.2 mL
Preparation and Standardization of 0.1 N lodine Solution Preparation 1. Dissolve 14 g of iodine in a solution of 36 g of potassium iodide in 100 ml of water 2. Add 3 drops of hydrochloric acid and dilute to 1000 ml Standardization 1. Weigh 150 mg of arsenic trioxide (As203) and dissolve in 20 ml of 1 N sodium hydroxide by warming it necessary 2. Dilute with 40 ml of water, add 2 drops of methyl orange TS and follow with diluted hydrochloric acid until the yellow color is changed to pink 3. Add 2 grams of sodium bicarbonate, dilute with 50 ml off water, and add 3 ml of starch TS 4. Slowly titrate the lodine solution into the analyte until a permanent blue color is produced. 5. Calculate the normality. "Volume of iodine which produced the permanent blue color: 30.2 ml Standardization: REACTION Arsenic Trioxide Volume of iodine Normality As2O3 + 6NaOH → 2Na3AsO3 + 3H₂O Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ + H₂O DATA 0.150 g 30.2 mL
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter4: Types Of Chemical Reactions And Solution Stoichiometry
Section: Chapter Questions
Problem 47E
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