(Answered) For a melting point determination if the compound is less

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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 ___.

reacting with the other compounds.
changing the ionization of the pH sensitive functional groups
changing boiling points of the compounds
removing salt from the mixture

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