Why should activated carbon beused during a recrystallization?
Under which circumstances is itwise to use a mixture of solvents to carry out arecrystallization?
Why is gravity filtration ratherthan suction filtration used to remove sus- pended impurities andcharcoal from a hot solution?
Why is a fluted filter paper usedin gravity filtration?
-
Why is the final product from therecrystallization process isolated by vacuum filtration rather thangravity filtration?
Why should you never use a beakerfor recrystallization?
2. What is the effect of an insoluble impurity, suchas sodium sulfate, on the observed melting point of acompound?
3. Three test tubes, labeled A, B, and C, containsubstances with approximately the same melting points. How couldyou prove that the test tubes contain three different chemicalcompounds?
4. One of the most common causes of inaccuratemelting points is too rapid heat- ing of the melting point bath.Under these circumstances, how will the observed melting pointcompare to the true melting point?
5. Strictly speaking, why is it incorrect to speakof a melting point?
6. Whateffect would the incomplete drying of a sample (for example, theincom-
plete removal of arecrystallization solvent) have on the melting point?
7. Why should the melting point sample be finelypowdered?
You have an unknown with anobserved melting point of 90
Why should activated carbon beused during a recrystallization?
Under which circumstances is itwise to use a mixture of solvents to carry out arecrystallization?
Why is gravity filtration ratherthan suction filtration used to remove sus- pended impurities andcharcoal from a hot solution?
Why is a fluted filter paper usedin gravity filtration?
-
Why is the final product from therecrystallization process isolated by vacuum filtration rather thangravity filtration?
Why should you never use a beakerfor recrystallization?
2. What is the effect of an insoluble impurity, suchas sodium sulfate, on the observed melting point of acompound?
3. Three test tubes, labeled A, B, and C, containsubstances with approximately the same melting points. How couldyou prove that the test tubes contain three different chemicalcompounds?
4. One of the most common causes of inaccuratemelting points is too rapid heat- ing of the melting point bath.Under these circumstances, how will the observed melting pointcompare to the true melting point?
5. Strictly speaking, why is it incorrect to speakof a melting point?
6. Whateffect would the incomplete drying of a sample (for example, theincom-plete removal of arecrystallization solvent) have on the melting point?
7. Why should the melting point sample be finelypowdered?
You have an unknown with anobserved melting point of 90
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