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The melting point will be lowered and broadened.

Incomplete drying of a sample may result in the presence of impurities. When impurities remain present in a sample, the melting point is both lowered and broadened. For example, if the normal mp of a substance is 104C - 106C, an improperly dried substance may contain impurities thus lowering and broadening the melting point range to something like 85C - 97C. (Note: these numbers are just arbitrarily chosen for the purpose of the example).

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