Postlab Report for Assessing Intermolecular Forces by GC and Microscale Distillation

Postlab Report for Assessing Intermolecular Forces by GC and Microscale Distillation

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Postlab Report for Assessing Intermolecular Forces by GC and Microscale Distillation Chemistry 112L Section 001 September 24, 2014 1. Fill in the following tables with data from the Class Data Table. Use the data to answer the questions associated with each table’s data. Add space as needed to accommodate your Lewis Structures and answers. Lewis Structures are on an attached sheet of notebook paper. Table I. Compound Lewis Structure Molecular Weight (g) Distillation Range (°C) Retention Time (min) Acetone 58.08 28.2 - 53.0 0.775 2-butanone 72.10 74.5 -76.0 1.2 2-pentanone 86.13 95.5 -102.5 2.335 a. Based on the information in Table I, what trends can you associate with this group of ketones? Pay specific attention to the effects molecular weight have on the data. All of these compounds have dipole-dipole interactions. However their size and weight varies. Starting from the top of the table there is the smallest in size and weight compound acetone. This compound has the lowest distillation range of the three because the heavier and bigger a compound with the same intermolecular forces as the compounds your comparing it to the higher the boiling point will be. As you move down the table the mass, size, boiling point, and distillation range, and retention time all increase. Table II. Compound Lewis Structure Molecular Weight (g) Distillation Range (°C) Retention Time (min) 2-butanone 72.10 74.5 – 76.0 1.2 2-pentanone 86.13 95.5 – 102.5 2.335 b. Based on the information in Table II, what trends can you associate with this group of ketones? Pay specific attention to the effects branching of the carbon skeleton has on the data.
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