3. A pure white crystalline compound was found to melt at 112.5-113.0°C when taken on amelting point apparatus, and on further heating, the liquid was found to turn brown at ca.145-150 °C. The capillary containing the melted compound was set aside to cool, andresolidify. When the sample was retried, using the same capillary the sample melted at133.6-154.5°C. Why is the melting point higher than 112°, and the range so wide?4. When performing a melting point on a solid compound using a melting point apparatus, twomelting point determinations were made. One sample, which was 1 mm in height in thecapillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm inheight. What would you expect the approximate melting point to be for this sample,assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of thesample) (Give an actual numerical approximation!)

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A pure white crystalline compound was found to melt at 112.5 C when taken on a melting point annaratus and on further heating he liguid was found to turn brown at ca

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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Question

100%

3. A pure white crystalline compound was found to melt at 112.5-113.0°C when taken on a
melting point apparatus, and on further heating, the liquid was found to turn brown at ca.
145-150 °C. The capillary containing the melted compound was set aside to cool, and
resolidify. When the sample was retried, using the same capillary the sample melted at
133.6-154.5°C. Why is the melting point higher than 112°, and the range so wide?
4. When performing a melting point on a solid compound using a melting point apparatus, two
melting point determinations were made. One sample, which was 1 mm in height in the
capillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm in
height. What would you expect the approximate melting point to be for this sample,
assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the
sample) (Give an actual numerical approximation!)

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