Titrimetry
For the determination of the levels of Ascorbic acid (Vitamin C: C6H8O6), in Mazoe orange crush, ascorbic is oxidized using a known amount of I3– to dehydroascorbic acid, C6H6O6, and back titrating the excess I3– with Na2S2O3. A 4.00-mL sample of filtered Mazoe orange crush was treated with 40.00 mL of 0.00823 M I3–. After the oxidation was complete, 11.40 mL of 0.06981 M Na2S2O3 was needed to reach the endpoint.
C6H8O6 (aq)+ I3– (aq)→ I−(aq)+ C6H6O6 (aq)+ H+(aq)
I3−(aq)+ S2O32−(aq)→S4O62−(aq)+ I−(aq)
i) What is the concentration of ascorbic acid in Mazoe Orange crush in mg/100 mL.
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Write the balanced reaction equation for the oxidation of ascorbic acid (C6H8O6) by triiodide ion (I3−)...
Write the balanced reaction equation for the oxidation of ascorbic acid (C6H8O6) by triiodide ion (I3−) in acidic medium to produce dehydroascorbic acid (C6H6O6) and I−.
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Government and industry analysts routinely measure the quantity of ascorbic acid (vitamin C, C6H8O6) in commercial products such as fruit juices and vitamin tablets. The ascorbic acid reacts with excess iodine, and the amount of I2 remaining is determined with sodium thiosulfate (Na2S2O3). It is suspected by the Montreal Fraud Division that a prominent natural foods importer is defrauding his customers by claiming that his vitamin C tablets contain 45% of the active ingredient ascorbic acid. In one analysis, a...
ascorbic acid (vitamin C, MM= 176.126 g/mole) is a reducing agent, reacting as follows: C6H8O6 ---->...
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A sample of copper ore with a mass of 0.4225 g was dissolved in acid. A...
A sample of copper ore with a mass of 0.4225 g was dissolved in acid. A solution of potassium iodide was added, which caused the reaction: 2Cu2+(aq) + 5I– (aq) → I3–(aq ) + 2CuI(s) The I3– that formed reacted quantitatively with exactly 29.96 mL of 0.02100 M Na2S2O3 according to the following equation: I3– (aq) + 2S2O32– (aq) → 3I– (aq ) + S4O62–(aq ) What was the percentage by mass of copper in the ore? If the ore...
6. The ozone content in polluted air can be determined by an iodometric titration. The air...
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Ascorbic acid or Vitamin C is a simple compound with the following chemical formula C6H8O6. Besides...
Ascorbic acid or Vitamin C is a simple compound with the following chemical formula C6H8O6. Besides being an acid, it is also a reducing agent. One method for determining the amount of vitamin C in a sample is to titrate it with a solution of bromine, Br2, a good oxidizing agent based on the following chemical equation: Br2 (aq) + C6H8O6 (aq) --> 2HBr (aq) + C6H6O6 (aq) Suppose a 1.00-g “chewable” vitamin C tablet requires 27.85 mL of 0.102 M...
Ascorbic acid or Vitamin C is a simple compound with the following chemical formula C6H8O6. Besides...
Ascorbic acid or Vitamin C is a simple compound with the following chemical formula C6H8O6. Besides being an acid, it is also a reducing agent. One method for determining the amount of vitamin C in a sample is to titrate it with a solution of bromine, Br2, a good oxidizing agent based on the following chemical equation: Br2 (aq) + C6H3O6 (aq) → 2HBr (aq) + C6H6O6 (aq) Suppose a 1.00-g “chewable” vitamin C tablet requires 27.85 mL of 0.102...
how do i solve these? + LDV Room BUL Pre-Laboratory Exercise: Show all work to receive...
how do i solve these?
+ LDV Room BUL Pre-Laboratory Exercise: Show all work to receive full credit. 1. Name three fruits and/or vegetables that are good sources of vitamin C. Guava, Kiwi, orange 2. In the jodine ascorbic acid reaction which is the (a) oxidizing agent? (b) the reducing agent? Which is (c) oxidized (d) reduced? (a) ascorbic acid (b) iodine (c) oxidized (d) reduced 253.88 3. 27.46 mL of I was standardized with a 0.1000 g sample of...
In Lab 9, students performed acid-base titrations. Redox reactions can also be used in titrations. An...
In Lab 9, students performed acid-base titrations. Redox
reactions can also be used in titrations. An example is the
titration of ascorbic acid
(H2C6H6O6) in lemon
juice using triiodide (I3− ). A starch
indicator will turn the solution blue-black at the endpoint. The
half-reactions involved are shown below.
C6H6O6 + 2 H+ + 2
e−
→
H2C6H6O6
+0.06 V
I3− + 2
e−
→
3 I−
+0.53 V
(a) What is the net redox reaction that occurs? (Use the lowest...
Ascorbic acid (vitamin C, MM 176.124 g/mol)) can be determined using an iodometric back titration. A...
Ascorbic acid (vitamin C, MM 176.124 g/mol)) can be determined using an iodometric back titration. A vitamin C tablet was dissolved in 60 mL of 0.3 M H2S04. To the dissolved tablet, 2 g of KI and 50.00 mL of 0.0105 M KIO3 were added, resulting in the formation of a dark orange solution indicating the presence of 13-. The resulting solution was titrated with 0.0685 M S2032- until the starch indicator turned purple. If the end point was observed...
Ascorbic acid or Vitamin C is a simple compound with the following chemical formula C6H8O6. Besides being an acid, it is also a reducing agent. One method for determining the amount of vitamin C in a sample is to titrate it with a solution of bromine, Br2, a good oxidizing agent based on the following chemical equation: Br2 (aq) + C6H3O6 (aq) → 2HBr (aq) + C6H6O6 (aq) Suppose a 1.00-g “chewable” vitamin C tablet requires 27.85 mL of 0.102...
how do i solve these?
+ LDV Room BUL Pre-Laboratory Exercise: Show all work to receive full credit. 1. Name three fruits and/or vegetables that are good sources of vitamin C. Guava, Kiwi, orange 2. In the jodine ascorbic acid reaction which is the (a) oxidizing agent? (b) the reducing agent? Which is (c) oxidized (d) reduced? (a) ascorbic acid (b) iodine (c) oxidized (d) reduced 253.88 3. 27.46 mL of I was standardized with a 0.1000 g sample of...
In Lab 9, students performed acid-base titrations. Redox
reactions can also be used in titrations. An example is the
titration of ascorbic acid
(H2C6H6O6) in lemon
juice using triiodide (I3− ). A starch
indicator will turn the solution blue-black at the endpoint. The
half-reactions involved are shown below.
C6H6O6 + 2 H+ + 2
e−
→
H2C6H6O6
+0.06 V
I3− + 2
e−
→
3 I−
+0.53 V
(a) What is the net redox reaction that occurs? (Use the lowest...
Ascorbic acid (vitamin C, MM 176.124 g/mol)) can be determined using an iodometric back titration. A vitamin C tablet was dissolved in 60 mL of 0.3 M H2S04. To the dissolved tablet, 2 g of KI and 50.00 mL of 0.0105 M KIO3 were added, resulting in the formation of a dark orange solution indicating the presence of 13-. The resulting solution was titrated with 0.0685 M S2032- until the starch indicator turned purple. If the end point was observed...
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