Lecture2 - Some Terminology of Mixing Solution: Solute:...

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Some Terminology of Mixing Solution: A homogenous mixture of two or more compounds. Solute: Compound present in lesser amount. Solvent: Compound present in greater amount. Miscibility: Two components of a solution are inFnitely soluble in each other. Saturation: Maximum amount of solute dissolved at a given temperature.
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The Thermodynamics of Mixing H mixture = H Sep. A:A + H Sep. B:B + H Assoc. A:B positive generally negative When H mixture = 0 Then H Sep. A:A + H Sep. B:B = H Assoc. A:B For example, pentane is completely miscible with octane. pentane octane “Like Dissolves Like”
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When H mixture = 0 Why Do They Mix? G mix = H mix T S mix
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H Sep. Water : Forces being broken up include ID-ID, D-D H Sep. EtOH : Forces being broken up include ID-ID, D-ID, D-D The ID-ID interactions in ethanol are more important than in water, since there is a small “non-polar region” in ethanol. The D-D interactions in water are more signifcant than in ethanol since water has two hydrogens versus one in ethanol capable o± hydrogen-bonding. Consider the Mixing o± Ethanol (EtOH) and Water (H
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This note was uploaded on 10/25/2009 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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Lecture2 - Some Terminology of Mixing Solution: Solute:...

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