
(a)
Interpretation:
The disadvantages of the use of too little drying agent should be determined.
Concept introduction:
Drying agents are used to remove water from organic solvents. Mostly anhydrous drying agents are used that react with water to form insoluble hydrates in organic solvents and can be easily removed by filtration. Parameters that are considered to choose an effective drying agent are as follows:
- Capacity: The maximum number of moles of water molecules that can be trapped by a salt or drying agent defines its capacity.
- Efficiency: The amount of water left behind in the organic solvent after the drying process is called efficiency.
- Speed of removal of water: Time taken by the drying agent to form hydrate determines the speed of removal of water.
- Chemical inertness: Drying agents should be chemically inert that is it should not react with the organic solvent and the organic compounds dissolved in it.
(b)
Interpretation:
The disadvantages of the use of too much drying agent should be determined.
Concept introduction:
Drying agents are used to remove water from organic solvents. Mostly anhydrous drying agents are used that react with water to form insoluble hydrates in organic solvents and can be easily removed by filtration. Parameters that are considered to choose an effective drying agent are as follows:
- Capacity: The maximum number of moles of water molecules that can be trapped by a salt or drying agent defines its capacity.
- Efficiency: The amount of water left behind in the organic solvent after the drying process is called efficiency.
- Speed of removal of water: Time taken by the drying agent to form hydrate determines the speed of removal of water.
- Chemical inertness: Drying agents should be chemically inert that is it should not react with the organic solvent and the organic compounds dissolved in it.

Want to see the full answer?
Check out a sample textbook solution
Chapter 11 Solutions
Laboratory Techniques in Organic Chemistry
- I need help with the followingarrow_forwardFor Raman spectroscopy/imaging, which statement is not true regarding its disadvantages? a) Limited spatial resolution. b) Short integration time. c) A one-dimensional technique. d) Weak signal, only 1 in 108 incident photons is Raman scattered. e) Fluorescence interference.arrow_forwardUsing a cell of known pathlength b = 1.25115 x 10-3 cm, a water absorption spectrum was measured. The band at 1645 cm-1, assigned to the O-H bending, showed an absorbance, A, of 1.40. a) Assuming that water density is 1.00 g/mL, calculate the water molar concentration c (hint: M= mole/L) b) Calculate the molar absorptivity, a, of the 1645 cm-1 band c) The transmitted light, I, can be written as I= Ioexp(-xb), where x is the absorption coefficient (sometimes designated as alpha), Io is the input light, and b is the cell pathlength. Prove that x= (ln10)*x*c. (Please provide a full derivation of the equation for x from the equation for I). d) Calculate x for the 1645 cm-1 bandarrow_forward
- For CARS, which statement is not true regarding its advantages? a) Contrast signal based on vibrational characteristics, no need for fluorescent tagging. b) Stronger signals than spontaneous Raman. c) Suffers from fluorescence interference, because CARS signal is at high frequency. d) Faster, more efficient imaging for real-time analysis. e) Higher resolution than spontaneous Raman microscopy.arrow_forwardDraw the major product of the Claisen condensation reaction between two molecules of this ester. Ignore inorganic byproducts. Incorrect, 5 attempts remaining 1. NaOCH3/CH3OH 2. Acidic workup Select to Draw O Incorrect, 5 attempts remaining The total number of carbons in the parent chain is incorrect. Review the reaction conditions including starting materials and/or intermediate structures and recount the number of carbon atoms in the parent chain of your structure. OKarrow_forwardUsing a cell of known pathlength b = 1.25115 x 10-3 cm, a water absorption spectrum was measured. The band at 1645 cm-1, assigned to the O-H bending, showed an absorbance, A, of 1.40. a) Assuming that water density is 1.00 g/mL, calculate the water molar concentration c (hint: M= mole/L) b) Calculate the molar absorptivity, a, of the 1645 cm-1 band c) The transmitted light, I, can be written as I= Ioexp(-xb), where x is the absorption coefficient (sometimes designated as alpha), Io is the input light, and b is the cell pathlength. Prove that x= (ln10)*x*c d) Calculate x for the 1645 cm-1 bandarrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks ColeChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningEBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning



