(a) Fluorenone (the “impurity” added to both the sulfanilamide and the fluorene) has a melting point of 84 ºC. How would you expect the melting point of the impure (pre-crystallization) sulfanilamide (M.P. 166 ºC) to be different if the 5% impurity were trans-cinnamic acid (MP 133 ºC) instead of fluorenone? What about the melting point of the impure fluorene (M.P. 116 ºC)?
(b) Would you expect that changing the initial 5% impurity to trans-cinnamic acid have any effect on the melting point ranges of your purified sulfanilamide and/or fluorene? If so, how would you anticipate the melting point range to be different? If not, why not?