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Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011   1. Which of the following is the oxidizing agent?* Na3AsO3 I2 NaHCO3 NaOH   2. Which of the following is the reducing agent?* Na3AsO3 I2 NaHCO3 NaOH   3. To balance the equation, what is the coefficient of I2?* 4 3 2 1   4. To balance the equation, what is the coefficient of Na3AsO4?* 5 3 2 1

Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011   1. Which of the following is the oxidizing agent?* Na3AsO3 I2 NaHCO3 NaOH   2. Which of the following is the reducing agent?* Na3AsO3 I2 NaHCO3 NaOH   3. To balance the equation, what is the coefficient of I2?* 4 3 2 1   4. To balance the equation, what is the coefficient of Na3AsO4?* 5 3 2 1

Chemistry
Chemistry
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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
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Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011

 

1. Which of the following is the oxidizing agent?*
Na3AsO3
I2
NaHCO3
NaOH
 
2. Which of the following is the reducing agent?*
Na3AsO3
I2
NaHCO3
NaOH
 
3. To balance the equation, what is the coefficient of I2?*
4
3
2
1
 
4. To balance the equation, what is the coefficient of Na3AsO4?*
5
3
2
1
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 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 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 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 Arsenic Trioxide Volume of iodine Normality As₂O3 + 6NaOH → 2Na3AsO3 + 3H₂O Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ + H₂O DATA 0.150 g 30.2 mL
Transcribed Image Text: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 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 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 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 Arsenic Trioxide Volume of iodine Normality As₂O3 + 6NaOH → 2Na3AsO3 + 3H₂O Na3ASO3 + 12 + NaHCO3 → Na3AsO4 + Nal + CO₂ + H₂O DATA 0.150 g 30.2 mL
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