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Unformatted text preview: Post-Lab Question 9/27/07 1. p. 59, #2 What is the effect of an insoluble impurity, such as sodium sulfate on the observed melting point of a compound? It is apparent that the impurity must be soluble in the compound, so insoluble impurity such as sodium sulfate will not depress the melting point. 2. p. 59 #3 Three test tubes, labeled A, B, and C, contain substances with approximately the same melting points. How could you prove the test tubes contain three different chemical compounds? In order to check mix the substance by A+B, B+C, A+C and use mel-temp to check the melting point. After checking melting temperature if all of three melting temperatures are same, then they are same substance, but if three set of tubes have different melting temperature, they are different substances. 3. p. 87, #5 Under what circumstances is it wise to use a mixture of solvents to 3....
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This note was uploaded on 03/04/2008 for the course CHEM 351L taught by Professor Perks during the Fall '08 term at UMBC.
- Fall '08