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
Chapter11: Properties Of Solutions
Section: Chapter Questions
Problem 109AE: Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray...
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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
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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