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For a melting point determination, if the compound is less pure, then the melting point will generally be higher or lower and why?
Lower, impurities may react to form gasses which dissipate at room temperature
Lower, because defects in a crystal lattice require less energy to break the lattice
Higher, additional defects will be harder to melt
Higher, impurities may react to for liquids which do not dissipate at room temperature
Acid-base extractions remove compounds by ___.
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