5. The percent recovery in recrystallization is usually less than 100% (although sometimes it can be...
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5. The percent recovery in recrystallization is usually less than 100% (although sometimes it can be 100% or larger, see the next problem). This is due to loss of impurity, some material left dissolved in the mother liquor and "mechanical losses". Explain what these mechanical losses really are. 6. When you calculate a percent recovery you may find sometimes that it is larger than 100%. Assuming this is NOT due to errors associated with zeroing the balance, subtracting the weight of the watch glass or weigh paper, or inaccuracies in the balance calibration, suggest a possible reason for this. 7. Intermolecular forces are not chemical bonds. Below are two acetonitrile molecules, add to the drawing the 8+ and & symbols to indicate the atoms with the largest partial charges, AND draw the dipole- dipole intermolecular forces using the dashed-line notation for intermolecular forces that we use in these lab packets. Clearly indicate the dipole-dipole interactions that you drew. (3 pts) H3C-C=N: :N=C-CH3 5. The percent recovery in recrystallization is usually less than 100% (although sometimes it can be 100% or larger, see the next problem). This is due to loss of impurity, some material left dissolved in the mother liquor and "mechanical losses". Explain what these mechanical losses really are. 6. When you calculate a percent recovery you may find sometimes that it is larger than 100%. Assuming this is NOT due to errors associated with zeroing the balance, subtracting the weight of the watch glass or weigh paper, or inaccuracies in the balance calibration, suggest a possible reason for this. 7. Intermolecular forces are not chemical bonds. Below are two acetonitrile molecules, add to the drawing the 8+ and & symbols to indicate the atoms with the largest partial charges, AND draw the dipole- dipole intermolecular forces using the dashed-line notation for intermolecular forces that we use in these lab packets. Clearly indicate the dipole-dipole interactions that you drew. (3 pts) H3C-C=N: :N=C-CH3
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5Several things can lead to mechanical losses during recrystallization including Transfer Losses Parts of the material may be lost during the transfer process or remain stuck to the glasswares surface... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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