if impurities are present in water freezes at a temoerature less than 0.c this is true due to the i factor in the melting point depression equation, but this equation only holds for pure liquids and "impure" liquids, commonly refe...
http://wiki.answers.com/Q/Why_do_impurities_in_a_solid_...
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Impurity and melting point? Insoluble impurity melting point? Does impurity always lower melting point? ... Does an impurity affect the melting point of a compoundexplain? State the effect of impurity in the melting point of a compound? How do impurities affect the melting point of an organic compound? What effects a...
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wiki.answers.com/Q/Does_an_impurity_affect_the_melting_...
wiki.answers.com/Q/Does_an_impurity_affect_the_melting_point_of_a_compound
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Separation of Solids: Recrystallization and Melting Points ... In addition, the presence of impurities will affect the melting point of a substance in a predictable way: impurities always lower the melting point, no matter what impurities are present, and the amount of change will depend on the amount of the impurity-
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www.miracosta.edu/home/dlr/210exp1b.htm
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A sample is impure if it has a melting point range that is lower and/or wider than that the literature value.More impurities increase this effect. ... Experimental melting points should be always reported as a range, for example, 42-44°.
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www.csi.edu/ip/physci/faculty/rex/mptips.htm
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This phenomenon is called sweating and should not be mistaken for melting. The initial melting point temperature always corresponds to the first appearance of liquid within the bulk of the sample itself. Some compounds decompose at or near their melting points.
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www.cerlabs.com/experiments/10875407013.pdf
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The upper limit of the melting range of a compound containing an impurity is always lower than that of the pure compound. Mixed Melting Points The melting point of a compound is a physical characteristic often used to identify the compound and provide information about its purity.
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www.barnard.edu/chem/orgolab/docs/EXPERIMENT%201.pdf
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The pure solid has a very tight crystal lattice and will have a sharp melting point. However, impurities will lower the melting point because it takes less energy to disrupt the crystal lattice. ... The answer is mixed melting points. Mix the unknown with a little urea and take another melting point. If the melting point...
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www2.volstate.edu/chem/2010/Labs/Melting_Point.html
www2.volstate.edu/chem/2010/Labs/Melting_Point.html
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A very general answer is that impurities always lower melting points. If you think of the salt as an impurity in snow or ice, it will reduce the temperature needed to melt the snow or ice. ... The melting spreads out from that point until the ice is melted or the salt is all dissolved. Salt acts as a freezing point...
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www.theanswerbank.co.uk/Science/Question95484.html
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When compounds are impure, they always have lower melting points. The impurities interfere with the way that pure crystals pack together, so the melting point is lower. Differences between experimental and reference values are usually in the range of 2-3 degrees.
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www.brainmass.com/homework-help/chemistry/organic-chemi...
www.brainmass.com/homework-help/chemistry/organic-chemistry/172457
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