In experiment of determining ascorbic acid concentration by a redox titration with potassium iodate, what can...
In experiment of determining ascorbic acid concentration by a redox titration with potassium iodate, what can be the factors which influence the results from this titration?
Ans what are the limitations of this method of determination of ascorbic acid?
Homework Answers
Temperature
Higher the temperature,more atoms and molecules react .
pH
pH influences the reaction speed
Oxygen
If there is no oxidiser present,the oxidation of ascorbic acid can be slowed down or prevented
Metal ions
They act as catalyst in the case of ascorbic acid
Limitations
•Iodine stains both skin and clothing. Utmost care is needed
•Ascorbic acid is susceptible to oxidation as time passes so the samples have to be prepared immediately before titrations
•Identification of end point in this titration is affected by the colouration of the sample solution used
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In experiment of determining ascorbic acid concentration by a
redox titration with potassium iodate, what can...
Vitamin C in a titration with potassium iodate References Mailings Review View AaBbcode Abccdee AaBbcc No...
Vitamin C in a titration with potassium iodate
References Mailings Review View AaBbcode Abccdee AaBbcc No Spacing Heading 1 Normal 3. A suitable method for the determination of vitamin C (C.H.O.) is a titration with potassium iodate (KIO). Potassium iodate is used as a titrant and is added to an ascorbic acid solution that contains strong acid and potassium iodide (KI). Potassium iodate reacts with excess potassium iodide, liberating molecular iodine (12): [1] KIO, + 5KI + 6H 31, +6K...
Determination of Vitamin C Concentration by Redox Titration An alternative titration method for determining the concentration...
Determination of Vitamin C Concentration by Redox Titration An alternative titration method for determining the concentration of vitamin C in a sample is to use an iodine solution. In this reaction iodine oxidizes the ascorbic acid to C&H&O 2. A 20.00 ml sample of a 1.00 mg/mL vitamin C solution is placed in a flask along with 1 mL of a 1% starch solution to serve as an indicator. A dilute solution of iodine is placed in a buret. A...
1) What chemical is the titrant in this experiment? What chemical is the analyte in this experiment? Experi...
1) What chemical is the titrant in this experiment? What
chemical is the analyte in this
experiment?
Experiment #8: Measuring the Vitamin C Content of Emergen-C™ Objectives: • Students will learn how to use a burette. • Students will learn how to use the iodine starch indicator system to monitor oxidation/reduction reactions. Students will learn how to conduct a titration to determine the amount of analyte in an unknown solution. • Students will learn about ascorbic acid's role as a...
what are the possible errors on using the iodic titration for determining ascorbic acid when your...
what are the possible errors on using the iodic titration for determining ascorbic acid when your result is lower than the rest of the group?
(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a...
(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a 500 mL volumetric flask. Then 50.00 mL of the solution was pipetted into a flask and treated with excess KI (2 g) and acid (10 mL of 0.5 M H2SO4). How many millimoles of I3− are created by the reaction? (b) The triiodide from part (a) reacted with 37.54 mL of Na2S2O3 solution. What is the concentration of the Na2S2O3 solution? (c) A 1.223...
2) What chemical reaction does the titrant contribute to this experiment? CHEM 1A Experiment #8: Measuring the Vit...
2)
What chemical reaction does the titrant contribute to this
experiment?
CHEM 1A Experiment #8: Measuring the Vitamin C Content of Emergen-C™ Objectives: Students will learn how to use a burette. Students will learn how to use the iodine starch indicator system to monitor oxidation/reduction reactions. • Students will learn how to conduct a titration to determine the amount of analyte in an unknown solution. • Students will learn about ascorbic acid's role as a biological reducing agent. Introduction: Vitamin...
A titration is a procedure for determining the concentration of a solution by allowing it to...
A titration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration (called a standard solution). Acid-base reactions and oxidation-reduction reactions are used in titrations. For example, to find the concentration of an HCI solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color...
You run a titration experiment to determine the mass of ascorbic acid (MM=176.12 g/mole) in a...
You run a titration experiment to determine the mass of ascorbic acid (MM=176.12 g/mole) in a vitamin C tablet. The tablet was dissolved in 100mL of water and the titration required 23.0 mL of 0.5M NaOH for complete neutralization of the acid, according to the following reaction: AscH2 (aq) + 2NaOH (aq) -> Asc^2- (aq) + 2H2O (l) + 2Na^+ (aq) a) Calculate the moles of NaOH used. b) Calculate the moles of acid in the solution. c) Calculate the...
Vitamin C (ascorbic acid) from foods can be measured by titration with I3-If 29.41 mL of...
Vitamin C (ascorbic acid) from foods can be measured by titration with I3-If 29.41 mL of I3- solution are required to react with 0.1970 g of pure ascorbic acid, what is the molarity of the I3- solution? A vitamin C tablet containing ascorbic acid plus inert binder was ground to a powder, and 0.4242 g was titrated by 31.63 mL of I3-. How many moles of ascorbic acid are present in the 0.4242 g sample? Find the weight percent of...
Experiment 8: Pre-Lab Questions Define: a. Titration b. end point c. oxidation d. ascorbic acid. 2....
Experiment 8: Pre-Lab Questions Define: a. Titration b. end point c. oxidation d. ascorbic acid. 2. What is the use of Vitamin C in our body? What can occur due to vitamin C deficiency? 3. What is the Recommend Daily Allowance (RDA) of vitamin C for adult males and females? Continue on the back 108
Vitamin C in a titration with potassium iodate
References Mailings Review View AaBbcode Abccdee AaBbcc No Spacing Heading 1 Normal 3. A suitable method for the determination of vitamin C (C.H.O.) is a titration with potassium iodate (KIO). Potassium iodate is used as a titrant and is added to an ascorbic acid solution that contains strong acid and potassium iodide (KI). Potassium iodate reacts with excess potassium iodide, liberating molecular iodine (12): [1] KIO, + 5KI + 6H 31, +6K...
Determination of Vitamin C Concentration by Redox Titration An alternative titration method for determining the concentration of vitamin C in a sample is to use an iodine solution. In this reaction iodine oxidizes the ascorbic acid to C&H&O 2. A 20.00 ml sample of a 1.00 mg/mL vitamin C solution is placed in a flask along with 1 mL of a 1% starch solution to serve as an indicator. A dilute solution of iodine is placed in a buret. A...
1) What chemical is the titrant in this experiment? What
chemical is the analyte in this
experiment?
Experiment #8: Measuring the Vitamin C Content of Emergen-C™ Objectives: • Students will learn how to use a burette. • Students will learn how to use the iodine starch indicator system to monitor oxidation/reduction reactions. Students will learn how to conduct a titration to determine the amount of analyte in an unknown solution. • Students will learn about ascorbic acid's role as a...
2)
What chemical reaction does the titrant contribute to this
experiment?
CHEM 1A Experiment #8: Measuring the Vitamin C Content of Emergen-C™ Objectives: Students will learn how to use a burette. Students will learn how to use the iodine starch indicator system to monitor oxidation/reduction reactions. • Students will learn how to conduct a titration to determine the amount of analyte in an unknown solution. • Students will learn about ascorbic acid's role as a biological reducing agent. Introduction: Vitamin...
A titration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration (called a standard solution). Acid-base reactions and oxidation-reduction reactions are used in titrations. For example, to find the concentration of an HCI solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color...
Experiment 8: Pre-Lab Questions Define: a. Titration b. end point c. oxidation d. ascorbic acid. 2. What is the use of Vitamin C in our body? What can occur due to vitamin C deficiency? 3. What is the Recommend Daily Allowance (RDA) of vitamin C for adult males and females? Continue on the back 108
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