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Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011   1. To balance the equation, what is the coefficient of sodium bicarbonate?* 5 3 2 1   2. What is the total number of electrons gain/loss of arsenic trioxide?* 2 4 6 8   3. What is the molecular weight of the primary standard?* 253.808 g/mol   197.841 g/mol 84.006 g/mol 191.889 g/mol   4. What is the meq of the primary standard?  0.254   0.049   0.099 0.096   5. What is the concentration of the iodine solution?  0.097 N 0.110 N   0.105 N   0.101 N

Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011   1. To balance the equation, what is the coefficient of sodium bicarbonate?* 5 3 2 1   2. What is the total number of electrons gain/loss of arsenic trioxide?* 2 4 6 8   3. What is the molecular weight of the primary standard?* 253.808 g/mol   197.841 g/mol 84.006 g/mol 191.889 g/mol   4. What is the meq of the primary standard?  0.254   0.049   0.099 0.096   5. What is the concentration of the iodine solution?  0.097 N 0.110 N   0.105 N   0.101 N

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter13: Solutions And Their Behavior
Section: Chapter Questions
Problem 57GQ: Dimethylglyoxime [DMG, (CH3CNOH)2] is used as a reagent to precipitate nickel ion. Assume that 53.0...
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Atomic Wt:   O = 15.999 As = 74.922  H = 1.008 Na = 22.990I = 126.904 C = 12.011

 

1. To balance the equation, what is the coefficient of sodium bicarbonate?*
5
3
2
1
 
2. What is the total number of electrons gain/loss of arsenic trioxide?*
2
4
6
8
 
3. What is the molecular weight of the primary standard?*
253.808 g/mol
 
197.841 g/mol
84.006 g/mol
191.889 g/mol
 
4. What is the meq of the primary standard? 
0.254
 
0.049
 
0.099
0.096
 
5. What is the concentration of the iodine solution? 
0.097 N
0.110 N
 
0.105 N
 
0.101 N
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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