Lab Report - Experiemnt#3 - Ave.Questions Tf A:B...

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A:B Composition Ave. T f ( ) Questions 1a. A researcher was not worried about obtaining the melting point after spilling sand in the compound since impurities that are insoluble in the liquid do not form a solution with the liquid compound. Therefore, they do not affect the intermolecular forces and therefore they do not affect the vapor pressure of the liquid as well as the melting point of the compound. 1b. This assumption is invalid because basking soda undergoes acid-base reaction with compound X. The compound X is an acid with carboxylic end and baking soda is a base. Since baking soda’s impurities are soluble in the liquid phase of compound X affecting the intermolecular forces, the vapor pressure of the liquid is lowered and therefore the melting point is lowered more. 2. XA : XB = 0.6:0.4 and 0.2:0.8 3. Two compounds are insoluble with each other and thus they do not affect the intermolecular force, vapor pressure, and the melting point range. 4. No, it would be an unwise decision to rerun the entire experiment to record the final temperature of their melting point sample. Instead, it would be better to control the heating rate, which is the most important factor in obtaining accurate melting points. The temperature should be rising slowly as the melting point of the sample is reached. If the temperature is rising rapidly, accurately recording readings will be difficult. Instead of
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This note was uploaded on 11/23/2009 for the course CHEM 3BL taught by Professor Chunmei during the Summer '08 term at University of California, Berkeley.

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Lab Report - Experiemnt#3 - Ave.Questions Tf A:B...

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