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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

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
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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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!)
Transcribed Image Text: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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