Does a pure organic compound has a definite melting point
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pure organic solid compound melts at a specific temperature or within a narrow temperature range (0.5 to 2°C). A melting range of 1–2°C indicates an organic compound is pure enough for most purposes. If a compound is contaminated with even small amounts of an impurity, the melting range will be wider and lower. As a rule of thumb, each 1% of the sample that is impurities will result in a 0.5°C depression of melting point.
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