Experimental Procedure. Choose an over the counter (OTC) vitamin tablet that contains ascorbic acid. Weigh out 1 tablet of the vitamin sample and transfer into a 100-mL beaker. Dissolve the tablet in distilled H;0 dilute the mixture to 250-mL using a volumetric flask. Obtain a 50-mL aliquot portion and titrate until the starch endpoint. Perform 3 trials. A. Determination of Ascorbic Acid from an OTC Vitamin Chemical Reactions: CH•O• (aq) + I; (aq) –→ A°(aq) + 2H*(aq) +CH«O¢ (aq) Details Preparation of Dilute Table Solution |Molarity of I; Standard Solution Molar Mass (g/mole) Ascorbic Acid Number of Tablets per Analysis Mass (g) Container plus 1 Tablet Mass (g) Container less 1 Tablet |Mass (g) of 1 Tablet Volume (mL) of Dilute Tablet Solution Titrimetric Analysis of Dilute Tablet 0.02512 M 176.14 12.2546 11.7824 0.4722 250.00 Trial 1 Trial 2 Trial 3 Solution Volume (mL.) of Aliquot Portion of Dilute Tablet Solution Titrated Final Buret Reading (mL) Initial Buret Reading (mL) Volume (mL.) I; Solution Delivered 50.00 50.00 50.00 11.64 22.80 11.20 0.20 11.64 0.00 No. of mmol I; Reacted No. of mmol Ascorbic Acid in Aliquot Total No. of mmol Ascorbic Acid Present in the Volumetric Flask Total Mass (mg) of Ascorbic Acid Present in 1 Tablet
Experimental Procedure. Choose an over the counter (OTC) vitamin tablet that contains ascorbic acid. Weigh out 1 tablet of the vitamin sample and transfer into a 100-mL beaker. Dissolve the tablet in distilled H;0 dilute the mixture to 250-mL using a volumetric flask. Obtain a 50-mL aliquot portion and titrate until the starch endpoint. Perform 3 trials. A. Determination of Ascorbic Acid from an OTC Vitamin Chemical Reactions: CH•O• (aq) + I; (aq) –→ A°(aq) + 2H*(aq) +CH«O¢ (aq) Details Preparation of Dilute Table Solution |Molarity of I; Standard Solution Molar Mass (g/mole) Ascorbic Acid Number of Tablets per Analysis Mass (g) Container plus 1 Tablet Mass (g) Container less 1 Tablet |Mass (g) of 1 Tablet Volume (mL) of Dilute Tablet Solution Titrimetric Analysis of Dilute Tablet 0.02512 M 176.14 12.2546 11.7824 0.4722 250.00 Trial 1 Trial 2 Trial 3 Solution Volume (mL.) of Aliquot Portion of Dilute Tablet Solution Titrated Final Buret Reading (mL) Initial Buret Reading (mL) Volume (mL.) I; Solution Delivered 50.00 50.00 50.00 11.64 22.80 11.20 0.20 11.64 0.00 No. of mmol I; Reacted No. of mmol Ascorbic Acid in Aliquot Total No. of mmol Ascorbic Acid Present in the Volumetric Flask Total Mass (mg) of Ascorbic Acid Present in 1 Tablet
Chemistry
10th Edition
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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please help with trial 1 so i can answer trial 2 and 3. thank you please show solution
Transcribed Image Text:Experimental Procedure.
Choose an over the counter (OTC) vitamin tablet that contains ascorbic acid. Weigh out 1 tablet of the vitamin
sample and transfer into a 100-mL beaker. Dissolve the tablet in distilled H20 dilute the mixture to 250-mL
using a volumetric flask. Obtain a 50-mL aliquot portion and titrate until the starch endpoint. Perform 3 trials.
A. Determination of Ascorbic Acid from an OTC Vitamin
Chemical Reactions: CH:Os (aq) + I: (aq) → 21'(aq) + 2H*(aq) + C¢H&Os (aq)
Details
Preparation of Dilute Table Solution
Molarity of I; Standard Solution
Molar Mass (g/mole) Ascorbic Acid
Number of Tablets per Analysis
Mass (g) Container plus 1 Tablet
Mass (g) Container less 1 Tablet
Mass (g) of 1 Tablet
Volume (mL) of Dilute Tablet Solution
Titrimetric Analysis of Dilute Tablet
0.02512 M
176.14
1
12.2546
11.7824
0.4722
250.00
Trial 1
Trial 2
Trial 3
Solution
Volume (mL) of Aliquot Portion of
Dilute Tablet Solution Titrated
Final Buret Reading (mL)
Initial Buret Reading (mL)
50.00
50.00
50.00
11.64
22.80
11.20
0.20
11.64
0.00
Volume (mL) I; Solution Delivered
No. of mmol I; Reacted
No. of mmol Ascorbic Acid in Aliquot
Total No. of mmol Ascorbic Acid
Present in the Volumetric Flask
Total Mass (mg) of Ascorbic Acid
Present in 1 Tablet
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