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do melting points tend to have positive or negative errors? what are two common errors in melting point experiments? when watching samples in a mel-temp

do melting points tend to have positive or negative errors? what are two common errors in melting point experiments?

when watching samples in a mel-temp apparatus to determine the start and end melting points, does there tend to be more positive or negative errors? what are two errors that can occur when determining melting point of a substance?

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