A paste of starch was tested using Benedict’s test, the Iodine Test, and Fehling’s Test. Before hydrolysis, Benedict’s test and Fehling's test results were both negative while Iodine’s test is positive. After adding 0.5 mL of conc. HCl to the paste, another 5 drops of NaOH were added and was tested using Fehling’s, Benedict’s Test, and Iodine Tests. Why is there a need to add NaOH to the sample? if yes, is it to make the sample neutral? why is it important for the sample to be neutral?
A paste of starch was tested using Benedict’s test, the Iodine Test, and Fehling’s Test. Before hydrolysis, Benedict’s test and Fehling's test results were both negative while Iodine’s test is positive. After adding 0.5 mL of conc. HCl to the paste, another 5 drops of NaOH were added and was tested using Fehling’s, Benedict’s Test, and Iodine Tests. Why is there a need to add NaOH to the sample? if yes, is it to make the sample neutral? why is it important for the sample to be neutral?
Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter43: Analysis For Vitamin C
Section: Chapter Questions
Problem 3ASA
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A paste of starch was tested using Benedict’s test, the Iodine Test, and Fehling’s Test. Before hydrolysis, Benedict’s test and Fehling's test results were both negative while Iodine’s test is positive. After adding 0.5 mL of conc. HCl to the paste, another 5 drops of NaOH were added and was tested using Fehling’s, Benedict’s Test, and Iodine Tests.
Why is there a need to add NaOH to the sample? if yes, is it to make the sample neutral? why is it important for the sample to be neutral?
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