Xanthoproteic Test To 2 mL of sample add 1 mL concentrated HNO3. Observe whether a heavy white precipitate is formed. Heat carefully and observe whether the precipitate turns yellow and finally dissolves. Record the color of the precipitate and/or the solution. Cool and make alkaline with 10% NaOH. Record the color. Question 1. What do you think was the white precipitate formed after the addition of nitric acid and why did it turn to yellow after heating? Question 2. Why did the mixture change in color after addition of 10% NaOH? Question 3. Will it give positive test to all the proteins?
Xanthoproteic Test To 2 mL of sample add 1 mL concentrated HNO3. Observe whether a heavy white precipitate is formed. Heat carefully and observe whether the precipitate turns yellow and finally dissolves. Record the color of the precipitate and/or the solution. Cool and make alkaline with 10% NaOH. Record the color. Question 1. What do you think was the white precipitate formed after the addition of nitric acid and why did it turn to yellow after heating? Question 2. Why did the mixture change in color after addition of 10% NaOH? Question 3. Will it give positive test to all the proteins?
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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Xanthoproteic Test
To 2 mL of sample add 1 mL concentrated HNO3. Observe whether a heavy white precipitate is formed. Heat carefully and observe whether the precipitate turns yellow and finally dissolves. Record the color of the precipitate and/or the solution. Cool and make alkaline with 10% NaOH. Record the color.
Question 1. What do you think was the white precipitate formed after the addition of nitric acid and why did it turn to yellow after heating?
Question 2. Why did the mixture change in color after addition of 10% NaOH?
Question 3. Will it give positive test to all the proteins?
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