lab 2 discussion - Experiment Two:Solubility and Acid-Base...

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Experiment Two:Solubility and Acid-Base Reactions In the solution of hexane, I predicted that all polar molecules would not mix or be miscible. This is because, “like dissolves like”, therefore nonpolar molecules, like hexane, will dissolve. A solution of hexane’s intermolecular forces is only as strong as the London Dispersion forces of hexane molecules, or the induced dipole-induced dipole affect. Diethyl Ether is nonpolar, therefore mixed completely with the hexane solution. Diethyl Ether has a smaller molecular weight but is still dominated by London Dispersion forces. Ethyl Acetate does have a small dipole moment. Intermolecular forces of dipole- dipole, or dipole-induced dipole, do have a role in this mixture. These forces were not great enough to keep the hexane molecules from completely surrounding the ethyl acetate, and therefore the ethyl acetate did mix with the hexane. Ethanol is also polar, but also has a carbon chain that promotes induced dipole-induced dipole interactions. In this case, the intermolecular forces between the ethanol molecules were not strong enough to hold the ethanol molecules together and ethanol completely mixed with the hexane, creating induced dipole-induced dipole interactions between the ethanol and hexane molecules. The dichloromethane molecule is only slightly polar. The chloro-carbon bonds do not cancel because of the molecule’s tetrahedral shape, but the bonds are not very polar to begin with. These dipole-dipole intermolecular forces were, again, not strong enough in the mixture and the dichloromethane completely mixed. Acetone can be considered to be slightly polar as well, but the electroegativity difference in carbon and oxygen is very small and therefore can act as a nonpolar solvent. It completely mixed with the hexane, and seemed miscible. The water molecule is polar. The hydrogen- oxygen bond experiences hydrogen bonding which creates a very polar molecule. Water did not mix with the hexane, but instead created a two-layered mixture. Water sunk to the
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This note was uploaded on 09/18/2011 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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lab 2 discussion - Experiment Two:Solubility and Acid-Base...

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