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A student has a mixture of two possible compounds. The student performs recrystallization to separate the two compounds. The student decides to identify the separated compound by melting point. The student's compound has a melting range of 206-207 °C at a ramp rate of 10 °C/min. The student's partner believes that they isolated compound 2, while the student thinks they have compound 1. Choose the best answer to go with this

A student has a mixture of two possible compounds. The student performs recrystallization to separate the two compounds. The student decides to identify the separated compound by melting point. The student's compound has a melting range of 206-207 °C at a ramp rate of 10 °C/min. The student's partner believes that they isolated compound 2, while the student thinks they have compound 1. Choose the best answer to go with this

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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### Recrystallization and Melting Point Analysis A student has a mixture of two possible compounds. The student performs recrystallization to separate the two compounds. The student decides to identify the separated compound by melting point. The student’s compound has a melting range of 206-207 °C at a ramp rate of 10 °C/min. The student’s partner believes that they isolated compound 2, while the student thinks they have compound 1. Choose the best answer to go with this scenario. #### Literature Melting Points: - **Compound 1**: 204 °C - **Compound 2**: 188 °C ### Question: **What is the best interpretation of the melting point data?** 1. ⃝ It is correct that they have compound 2. 2. ⃝ It is correct that they have compound 1. 3. ⃝ They did not separate the compounds properly, and it is still a mixture. 4. ⃝ The students have neither of the two compounds. 5. ⃝ The ramp rate is too high so the experimental melting range is not accurate. ### Explanation: - **Melting Point Identification:** Melting point is a characteristic property of a compound. When a compound is pure, it tends to have a sharp melting point range, close to the literature values under controlled conditions. - **Experiment vs. Literature Values:** - The experimental melting point (206-207 °C) is slightly higher but close to the literature value for Compound 1 (204 °C). - The melting point is much higher than the literature value for Compound 2 (188 °C). Given this data, the most accurate conclusion would be: 2. ⃝ **It is correct that they have compound 1.** ### Detailed Analysis: Though the experimental and literature melting points have a slight discrepancy, the minimal deviation suggests that the isolated compound is likely to be compound 1. Compound 2 is an improbable match due to the large difference in melting points. ### Additional Note: - **Ramp Rate Consideration**: While a ramp rate of 10 °C/min is typical, substantial deviations can impact accuracy. However, the provided data suggests a close approximation to the literature value for compound 1, supporting the conclusion despite the ramp rate factor.
Transcribed Image Text:### Recrystallization and Melting Point Analysis A student has a mixture of two possible compounds. The student performs recrystallization to separate the two compounds. The student decides to identify the separated compound by melting point. The student’s compound has a melting range of 206-207 °C at a ramp rate of 10 °C/min. The student’s partner believes that they isolated compound 2, while the student thinks they have compound 1. Choose the best answer to go with this scenario. #### Literature Melting Points: - **Compound 1**: 204 °C - **Compound 2**: 188 °C ### Question: **What is the best interpretation of the melting point data?** 1. ⃝ It is correct that they have compound 2. 2. ⃝ It is correct that they have compound 1. 3. ⃝ They did not separate the compounds properly, and it is still a mixture. 4. ⃝ The students have neither of the two compounds. 5. ⃝ The ramp rate is too high so the experimental melting range is not accurate. ### Explanation: - **Melting Point Identification:** Melting point is a characteristic property of a compound. When a compound is pure, it tends to have a sharp melting point range, close to the literature values under controlled conditions. - **Experiment vs. Literature Values:** - The experimental melting point (206-207 °C) is slightly higher but close to the literature value for Compound 1 (204 °C). - The melting point is much higher than the literature value for Compound 2 (188 °C). Given this data, the most accurate conclusion would be: 2. ⃝ **It is correct that they have compound 1.** ### Detailed Analysis: Though the experimental and literature melting points have a slight discrepancy, the minimal deviation suggests that the isolated compound is likely to be compound 1. Compound 2 is an improbable match due to the large difference in melting points. ### Additional Note: - **Ramp Rate Consideration**: While a ramp rate of 10 °C/min is typical, substantial deviations can impact accuracy. However, the provided data suggests a close approximation to the literature value for compound 1, supporting the conclusion despite the ramp rate factor.
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