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Unformatted text preview: As you can see, substance A has a lower melting point than substance B. But the mixture of them both has a lower melting point than either of the substances separately. Based on the class data, the eutectic point is a mixture of 30:70 or 40:60, with a final melting point of 65.8°c. It is the ratio of the two substances that has the lowest boiling point. Part III The final melting point of my unknown mixture was 62°c. I estimate that my mixture was 40:60 or 30:70. Both of these ratios have the same class data. In order to determine the composition of my unknown mixture I would create a 40:60 mixture and mix that with my unknown mixture. If the melting range of this resulting mixture is lower than the melting range of my unknown mixture, then I can conclude that my unknown mixture is not a 40:60 composition. I could then create a 30:70 mixture and repeat the previous steps. If my unknown mixture were indeed a 30:70 composition, then the melting range would remain constant....
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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 Berkeley.
- Spring '08