Consider a crystallization of sulfanilamide in which 10mL of hot 95% ethyl alcoh

Question

Consider a crystallization of sulfanilamide in which 10mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanilamide. After the solid has dissolved, the solution is cooled to room temperature and then placed in an ice water bath. No crystals form, even after scratching with a glass rod. Explain why this crystallization failed. What would you have to do at this point to make the crystallization work ? Assume that starting over again with a new sample is not an option. Consider a crystallization of sulfanilamide in which 10mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanilamide. After the solid has dissolved, the solution is cooled to room temperature and then placed in an ice water bath. No crystals form, even after scratching with a glass rod. Explain why this crystallization failed. What would you have to do at this point to make the crystallization work ? Assume that starting over again with a new sample is not an option.

Explanation / Answer

Crystallization of sulfanilamide did not occur because of the proper ratio of solute and solvent.

For crystallization of any substance, we need only that much amount of solvent, which can dissolve the solute means here large amount of solvent prevents crystallization of sulfanilamide. Thus for crystallization of sulfanilamide; concentrate the solution.

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