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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Atomic Wt: 0 15.999
126.904 C 12.011
=
As = 74.922
H = 1.008
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 mil
Standardization
Arsenic Trioxide
Volume of iodine
Normality
1. Weigh 150 mg of arsenic trioxide (As203) and dissolve in 20 ml of 1 N sodium hydroxide by warming if
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
Na = 22.9901 =
is changed to pink
Add 2 grams of sodium bicarbonate, dilute with 50 ml off water, and add 3 ml of starch TS
4. Slowly titrate the iodine 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
As2O3 + 6NaOH → 2Na3AsO3 + 3H₂O
Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ + H₂O
DATA
0.150 g
30.2 mL

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