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6: Miscellaneous Techniques

Last updated

Apr 7, 2022
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- 5.6C: Troubleshooting Rotary Evaporation
- 6.1: Melting Point

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6.1: Melting Point
Measurement of a solid compound's melting point is a standard practice in the organic chemistry laboratory. The melting point is the temperature where the solid-liquid phase change occurs
6.2: Boiling Point
A compound's "normal boiling point" refers to its boiling point at a pressure of 760 mmHg. A compound's boiling point is a physical constant just like melting point, and so can be used to support the identification of a compound.
- 6.2A: Overview of Boiling Point
- 6.2B: Step-by-Step Procedures for Boiling Point Determination
6.3: Sublimation
Some compounds are capable of sublimation, which is the direct phase change from solid to gas. Sublimation is an analogous process to boiling, as it occurs when a compound's vapor pressure equals its applied pressure (often the atmospheric pressure). Most solids do not have an appreciable vapor pressure at easily accessible temperatures, and for this reason the ability to sublime is uncommon. Compounds that are capable of sublimation tend to be those with weak intermolecular forces.
- 6.3A: Overview of Sublimation
- 6.3B: Step-by-Step Procedures for Sublimation in the Laboratory
6.4: Chemical Tests
Before spectroscopic analysis (IR, NMR) became commonplace in the organic chemistry lab, chemical tests were heavily relied upon to support compound identification. A chemical test is typically a fast reaction performed in a test tube that gives a dramatic visual clue (a color change, precipitate, or gas formation) as evidence for a chemical reaction.

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