Q:

# What is meant by the term "mixed melting point"?

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"Mixed melting point" is a technique used to identify chemical compounds. It is particularly used for organic compounds, where a sample with a known identity and melting point is mixed with an unknown purified sample to determine the melting point.

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Glass capillaries are used to determine the mixed melting point. An equal amount of the unknown and known substance are mixed and placed in one capillary. The two substances are also placed in separate capillaries. All three capillaries are heated simultaneously in the melting point apparatus. The melting point of the capillary with the mixed substances should not differ by more than 4 degrees Celsius from the melting point of the substances placed in separate capillaries.

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## Related Questions

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The melting point of sand, which consists mainly of silicon dioxide or silica, is approximately 2930 degrees Fahrenheit. Its boiling point is 4046 F.

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Freezing point depression represents the variation in the freezing temperature of a pure solvent from that of the solvent in solution. In the equation ΔT=Kf m i, where i is the van’t Hoff factor, Kf represents the molal freezing point depression constant, also called the cryoscopic constant.

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According to the Engineering Toolbox, petrol reaches its boiling point at a measurement of 203 degrees Farenheit. This measurement can also be indicated as 95 degrees Celsius on the metric scale.