Twenty 350 mg tablet of ascorbic acid was dissolved in water and diluted to 250 mL in a volumetric flask. A 25.00 mL aliquot was added with 50.00 mL standardized 0.0925 M I2. The solution turned brown due to the excess I2. The excess I2 was back titrated with 19.25 mL standard 0.09890 M Na2S2O3 until lemon yellow. Starch was added to produce a violet complex and titration was continued until the solution becomes colorless by addition of 2.25 mL Na2S2O3 titrant. Calculate the %w/w ascorbic acid in one tablet.
Twenty 350 mg tablet of ascorbic acid was dissolved in water and diluted to 250 mL in a volumetric flask. A 25.00 mL aliquot was added with 50.00 mL standardized 0.0925 M I2. The solution turned brown due to the excess I2. The excess I2 was back titrated with 19.25 mL standard 0.09890 M Na2S2O3 until lemon yellow. Starch was added to produce a violet complex and titration was continued until the solution becomes colorless by addition of 2.25 mL Na2S2O3 titrant. Calculate the %w/w ascorbic acid in one 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...
Related questions
Question
Back titration problem - Analysis of OTC Vitamin C
Twenty 350 mg tablet of ascorbic acid was dissolved in water and diluted to 250 mL in a volumetric flask. A 25.00 mL aliquot was added with 50.00 mL standardized 0.0925 M I2. The solution turned brown due to the excess I2. The excess I2 was back titrated with 19.25 mL standard 0.09890 M Na2S2O3 until lemon yellow. Starch was added to produce a violet complex and titration was continued until the solution becomes colorless by addition of 2.25 mL Na2S2O3 titrant. Calculate the %w/w ascorbic acid in one tablet.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Recommended textbooks for you
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY