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ChemistryOrganic Chemistry

Why Is Slow Heating Required to Get an Accurate Melting Point?

A slow heating rate near the melting point reduces thermal lag and gives time to observe onset and completion; too-rapid heating can bias the reading high.

Question

Why is it necessary to heat slowly when the temperature is near the melting point?

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Evidence boundary

This explanation applies to standard capillary melting-point measurements. Exact ramp-rate settings depend on the apparatus and laboratory procedure; the university and laboratory references checked here commonly use about 1–2 °C/min near the expected melting point. No compound-specific melting point is inferred.