If you have two compounds that have the same melting point, using melting point determination, how...
If you have two compounds that have the same melting point, using melting point determination, how will you confirm whether the two compounds are the same or different?
Homework Answers
To determine whether both compounds are same or not, mix both compounds and determine the melting point of mixture. If melting point of mixture remain the same then both compounds are same otherwise different.
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If you have two compounds that have the same melting point,
using melting point determination, how...
You may have noticed that % composition vs Melting Point graphs are given in % Mole...
You may have noticed that % composition vs Melting Point graphs are given in % Mole not 96 Weight. This is because melting point depression is a colligative property (review in your general chemistry text) that depends on the moles of impurity, the same number of moles of impurity of two different compounds will cause the same melting point depression! Before the advent of mass spectrometry this was one of the techniques used to determine the molecular weight of compounds....
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube...
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains a sample about 1−2 mm in height and the melting range is found to be 141−142°C. In the other determination, the sample height is 4−5 mm and the melting range is found to be 141−145°C. Explain the broader melting-point range observed for the second sample. The reported melting point for the compound is 143°C. Explain what may have caused the broader melting range...
1. You are conducting a melting-point determination to identify a compound whose handbook melting-point range is...
1. You are conducting a melting-point determination to identify a compound whose handbook melting-point range is 112 - 114 °C. Comment on the purity of the sample, and the possible identity of the substance, when your experimental melting-point range is : A. 114 -116 °C B. 94 - 102 °C I would C. 102 - 103 °C
Rank the following compounds in order of increasing melting point using the numbers 1 - 5....
Rank the following compounds in order of increasing melting point using the numbers 1 - 5. (Enter 1 for the lowest melting point and 5 for the highest melting point.) diamond, LiCl, C2H2, CaO, CHCl3
Why was a melting point determination not performed on the caffeine product?
Why was a melting point determination not performed on the caffeine product?
2. Some compounds sublime in the capillary and some decompose before melting. How do you determine...
2. Some compounds sublime in the capillary and some decompose before melting. How do you determine melting point of these compounds
Question 14 The melting point of a pure compound is known to be 110-111°. Describe the...
Question 14 The melting point of a pure compound is known to be 110-111°. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
Explain how you can crudely estimate the relative values for the melting points of two different ...
Explain how you can crudely estimate the relative values for the melting points of two different organic compounds? Show the structures of two organic compounds and explain your reasoning. Why can the estimate be rather inaccurate?
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
8. a. Explain why the melting point of pure phthalic acid is higher than that of...
8. a. Explain why the melting point of pure phthalic acid is higher than that of pure napthalene, when the two compounds have nearly the same molecular weight. b. Explain why the melting point of pure hexane is hgiher than that of pure cyclo-hexane, when the two compounds have nearly the same molecular weight. (Hint: reffer to structures)
You may have noticed that % composition vs Melting Point graphs are given in % Mole not 96 Weight. This is because melting point depression is a colligative property (review in your general chemistry text) that depends on the moles of impurity, the same number of moles of impurity of two different compounds will cause the same melting point depression! Before the advent of mass spectrometry this was one of the techniques used to determine the molecular weight of compounds....
1. You are conducting a melting-point determination to identify a compound whose handbook melting-point range is 112 - 114 °C. Comment on the purity of the sample, and the possible identity of the substance, when your experimental melting-point range is : A. 114 -116 °C B. 94 - 102 °C I would C. 102 - 103 °C
2. Some compounds sublime in the capillary and some decompose before melting. How do you determine melting point of these compounds
Question 14 The melting point of a pure compound is known to be 110-111°. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
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