EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
6th Edition
ISBN: 9781305687875
Author: Gilbert
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 3.3, Problem 22E
a)
Interpretation Introduction
Interpretation:Difference in melting points of sample with sample tube has height of
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
b)
Interpretation Introduction
Interpretation:Source of error in measurement of melting point of
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
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A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48
Pure aspirin has a melting point of 135-136 °C. Before the melting point was determined - if the sample contains water by absorbing moisture in the air - what effect could this have on the observed melting point from the sample?
Two test tubes contain the compounds having the same melting point .Using their MP's how would you determine whether the two test tubes contains same or different compounds?
Chapter 3 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
Ch. 3.2 - Prob. 1ECh. 3.2 - Prob. 2ECh. 3.2 - Prob. 3ECh. 3.2 - Prob. 4ECh. 3.2 - Prob. 5ECh. 3.2 - Prob. 6ECh. 3.2 - Prob. 7ECh. 3.2 - Prob. 8ECh. 3.2 - Prob. 9ECh. 3.2 - Prob. 10E
Ch. 3.2 - Prob. 11ECh. 3.2 - Prob. 12ECh. 3.2 - Prob. 13ECh. 3.2 - Prob. 14ECh. 3.2 - Prob. 15ECh. 3.2 - Prob. 16ECh. 3.2 - Prob. 17ECh. 3.2 - Prob. 18ECh. 3.2 - Prob. 19ECh. 3.2 - Prob. 20ECh. 3.2 - Prob. 21ECh. 3.2 - Prob. 22ECh. 3.2 - Prob. 23ECh. 3.2 - Prob. 24ECh. 3.2 - Prob. 25ECh. 3.2 - Prob. 26ECh. 3.2 - Prob. 27ECh. 3.2 - Prob. 28ECh. 3.2 - Prob. 29ECh. 3.2 - Prob. 30ECh. 3.2 - Prob. 31ECh. 3.2 - Prob. 32ECh. 3.2 - Prob. 34ECh. 3.3 - Prob. 1ECh. 3.3 - Prob. 2ECh. 3.3 - Prob. 3ECh. 3.3 - Prob. 4ECh. 3.3 - Prob. 5ECh. 3.3 - Prob. 6ECh. 3.3 - Prob. 7ECh. 3.3 - Prob. 8ECh. 3.3 - Prob. 10ECh. 3.3 - Prob. 11ECh. 3.3 - Prob. 12ECh. 3.3 - Prob. 13ECh. 3.3 - Prob. 14ECh. 3.3 - Prob. 15ECh. 3.3 - Prob. 16ECh. 3.3 - Prob. 17ECh. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Prob. 21ECh. 3.3 - Prob. 22ECh. 3.3 - Prob. 23ECh. 3.3 - Prob. 24ECh. 3.3 - Prob. 25ECh. 3.3 - Prob. 26E
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- A good sample of benzoic acid melts at 121-122˚C. However, a student had a sample that melted over a range of 114 to 118 ˚C. What did the student conclude about this sample?arrow_forwardThe paper used in chromatography is made of molecules with___parts A polar B nonpolararrow_forwardA pure compound has a literature melting point of 136 °C. In the laboratory, three different students recrystallized crude samples of the compound and measured the melting point range for the crystals that they recovered. In the order listed, which melting point ranges best correspond to a ‘pure’ compound, an ‘impure’ compound, and a compound that was heated too quickly while measuring its melting point? a. 132 – 136 °C; 134 – 139 °C; 136 – 137 °C b. 132 – 136 °C; 136 – 137 °C; 134 – 139 °C c. 134 – 139 °C; 132 – 136 °C; 136 – 137 °C d. 134 – 139 °C; 136 – 137 °C; 132 – 136 °C e. 136 – 137 °C; 132 – 136 °C; 134 – 139 °C f. 136 – 137 °C; 134 – 139 °C; 132 – 136 °Carrow_forward
- Describe the fractional distillation curve/grapharrow_forwardWhich statement is true? Statement 1: Melting point and boiling point can be used to identify known compounds. Statement 2: Melting point and boiling point can be used to assess the purity of a substance.arrow_forwardYou and your partner independently measure the melting point of the same pure sample .you observe q melting point of 126.5-129 c while your pwrthber observes a melting point of 126-132 how can two different results be obtained? Provide at least three possible explanationarrow_forward
- Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in rangearrow_forwardA 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 108-109 °C using a ramp rate of 2°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. Compound 1 Literature Melting point: 111 °C Compound 2 Literature Melting point: 104 °C A) It is correct that they definitely have compound 2. B)The students have neither of the two compounds. C) The ramp rate is too high so the experimental melting range is not accurate. D) The students likely have compound 2, but should do a mixed melting range experiment with a standard of compound 2 to be certain. E) They did not separate the compounds properly, and it is still a mixture. F) The students likely have compound 1, but should do a mixed melting range…arrow_forwardEnumerate methods to determine a compound's melting point.arrow_forward
- 1. The Ability of a substance to exist in different crystalline form a. Lattice b. Polymorphism c. Crystallization d. Amphoterism 2. A drug can exert its pharmacological effect only if it is a. Protein bound b. Protein unbound c. Free drug d. Both B & C e. Both A & C 3. In order for the drug to be ready and available for absorption, it must be release first from its dosage form with the exception of: a. Capsule b. Tablet c. Solution d. Suspension 4. All of the following are true, except a. Solubility increase with decrease particle size b. Solubility increase with increase surface area c. Solubility increase with increase particle size d. Solubility decrease with decrease surface area 5. The rate in which the drug appears in the bloodstream is also known as a. Half-life b. Potency c. Bioavailability d. Area under the curvearrow_forwardIf Compound Y is characterized by having a melting point of 124°C under normal atmospheric pressure. Determine which of the following samples (VWXY) is high likely to contain the highest % of Compound Y? Sample W (114-122°C) Sample V (126-131°C) Sample Y (121-123°C Sample X (119-120°C)arrow_forwardThe literature melting point of compound A is known to be at 54-55 °C. If a very small amount of Compound B, whose melting point is 81-82 °C, is mixed in with the Compound A, what would be expected to happen to the melting point of the mixture? a. The melting point would be slightly higher than 55 °C. b. The melting point would not be affected. c. The melting point would be a weighted average of the two melting points. d. The melting point would be slightly lower than 55 °C e. The effect on the melting point cannot be predicted.arrow_forward
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