The Melting Point And Boiling Point

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Results The results show that the highest melting point was 4–Hydroxybenzoic Acid and the lowest melting point was Sulfosalicylic Acid. The highest boiling point was Octanol and lowest boiling point was Methanol. When it came to the percent error the highest percent error calculated was pentanol and the lowest percent error was Propanol. Discussion During this lab the melting point ranges and boiling points were recorded from several substances. Based upon the structures of these various samples certain trends were expected to be followed. For example, with the melting points of pure substances are usually higher than the melting points of impure substances. In this lab the melting point of Benzoic Acid, Salicylic Acid, 3-Hydroxybenzoic Acid, 4–Hydroxybenzoic Acid, and Sulfosalicylic Acid were taken. If we apply the concept of pure substances having higher boiling points, it was expected for substances like 3-Hydroxybenzoic Acid and 4–Hydroxybenzoic Acid to have higher melting points and for substances like Benzoic Acid and Salicylic Acid to have lower melting points. As for Sulfosalicylic Acid, its melting point was the lowest so it was assumed that the substance was the most impure. It was proven that the fewer impurities call for higher melting points. This is due to the crystalline lattices structure of repeating ions or molecules. This lattice is held together by intermolecular forces that create a strong, stable structure. The solid must be heated to a certain
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