Question 1 10 pts When attempting to recrystallize a sample what should be done

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Question 1 10 pts When attempting to recrystallize a sample what should be done if a small portion of the material is completely insoluble when heating, even after adding additional solvent? Add more of the same solvent in attempts to dissolve the solid. A small amount of insoluble material will not affect the overall recrystallization, thus ignore and continue the recrystallization process Remove the insoluble portion via hot filtration, in which you pour the heated material through a filter to remove the insoluble portion (ensuring that you save the insoluble portion in a flask, so that you may go back and analyze the substance later if needed) then take the filtrate and continue the recrystallization process O Give up, as recrystallization is not the preferred method of purifcation for this mixture and fnd a different purinication method Question 2 10 pts When choosing a solvent for recrystallization which of the following is the most accurate statement? Low boiling point solvents are ideal. You should use a solvent that does not dissolve the compound at room temperature but will dissolve the compound at an elevated temperature O You should choose a solvent that will dissolve the compound at room temperature. You should use a solvent that doesn't dissolve the compound at room temperature.

Explanation / Answer

1. The third option is correct. You should remove the insoluble part by filtration otherwise, it will affect the recrystallization process.

2. The second option is correct. You should use a solvent that does not dissolve the compound at room temperature but will dissolve the compound at an elevated temperature.

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