BRAINCAKEMelting and Boiling Point Determination
Once a product has been made and purified, its melting temperature (for a solid) or boiling temperature (for a liquid) is measured. Comparing the value with a data book shows whether the product is the expected compound and how pure it is.
Melting temperature. A small amount of the dry, powdered solid is packed into a thin capillary tube sealed at one end. The tube is placed in an electric melting temperature apparatus (or attached to a thermometer in an oil bath) and heated slowly, especially near the expected value, so the sample and the thermometer stay at the same temperature. The temperatures at which the solid starts and finishes melting are recorded.
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All 11 lessons in Organic Synthesis · All Edexcel A-level Chemistry topics