Post-Lab Question 3 - Post-Lab Question 1 p 59#2 What is...

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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 
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