Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
6th Edition
ISBN: 9781305080461
Author: John C. Gilbert, Stephen F. Martin
Publisher: Brooks Cole
expand_more
expand_more
format_list_bulleted
Question
Chapter 3.2, Problem 24E
Interpretation Introduction
Interpretation:Less purity of second crop of crystals than first crop should be explained.
Concept introduction:Filtration is procedure that is used to remove insoluble impurities, decolorized activated carbon from solution and also for purification of compound. Liquid that has been passed through filter apparatus is called filtrate while solid that cannot pass through filter is known as residue.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Select all of the options below that are used to increase
the purity in the purification of crystals.
Stirring the solution after mixing.
Filtering the crystals
Recrystallization at least once.
Slow cooling during crystallization.
Heating the pure crystals
Fast cooling during crystallization.
Which of the following statements is true when considering temperature during a recrystallization?
More than one answer may be correct.
Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed.
It is important that the sample is dissolved in just enough hot solvent.
O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all.
Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.
We separated a mixture of sodium carbonate and calcium chloride using Gravity Filtration. Additionally, did vacuum filtration for crystallized Vannilin. However we were not able to recover 100% of the original sample the question is: what do you think are the factors that contribute to low percentage recovery?
Chapter 3 Solutions
Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
Ch. 3.2 - Prob. 1ECh. 3.2 - Prob. 2ECh. 3.2 - Prob. 3ECh. 3.2 - Prob. 4ECh. 3.2 - Prob. 5ECh. 3.2 - Prob. 6ECh. 3.2 - Prob. 7ECh. 3.2 - Prob. 8ECh. 3.2 - Prob. 9ECh. 3.2 - Prob. 10E
Ch. 3.2 - Prob. 11ECh. 3.2 - Prob. 12ECh. 3.2 - Prob. 13ECh. 3.2 - Prob. 14ECh. 3.2 - Prob. 15ECh. 3.2 - Prob. 16ECh. 3.2 - Prob. 17ECh. 3.2 - Prob. 18ECh. 3.2 - Prob. 19ECh. 3.2 - Prob. 20ECh. 3.2 - Prob. 21ECh. 3.2 - Prob. 22ECh. 3.2 - Prob. 23ECh. 3.2 - Prob. 24ECh. 3.2 - Prob. 25ECh. 3.2 - Prob. 26ECh. 3.2 - Prob. 27ECh. 3.2 - Prob. 28ECh. 3.2 - Prob. 29ECh. 3.2 - Prob. 30ECh. 3.2 - Prob. 31ECh. 3.2 - Prob. 32ECh. 3.2 - Prob. 34ECh. 3.3 - Prob. 1ECh. 3.3 - Prob. 2ECh. 3.3 - Prob. 3ECh. 3.3 - Prob. 4ECh. 3.3 - Prob. 5ECh. 3.3 - Prob. 6ECh. 3.3 - Prob. 7ECh. 3.3 - Prob. 8ECh. 3.3 - Prob. 10ECh. 3.3 - Prob. 11ECh. 3.3 - Prob. 12ECh. 3.3 - Prob. 13ECh. 3.3 - Prob. 14ECh. 3.3 - Prob. 15ECh. 3.3 - Prob. 16ECh. 3.3 - Prob. 17ECh. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Prob. 21ECh. 3.3 - Prob. 22ECh. 3.3 - Prob. 23ECh. 3.3 - Prob. 24ECh. 3.3 - Prob. 25ECh. 3.3 - Prob. 26E
Knowledge Booster
Similar questions
- 1. Why do certain components move further on the stationary phase than others? 2. Why was it important to have a wick and to keep the beaker covered with foil while the samples were developing?arrow_forwardClear and concise solutions please. Tha k uarrow_forward1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?arrow_forward
- BRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive materials.arrow_forward4. When performing a melting point on a solid compound using a melting point apparatus, two melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!) 5. For the same solid compound as the question above, if the 1 mm sample was heated at 60° per minute on a melting point apparatus, what would you expect for an approximate melting point? (note that at this heating rate, the sample will melt rather quickly, but again give an actual numerical approximation)arrow_forwardWhy is recrystallization not applicable to samples which contain large amount of impurities?arrow_forward
- In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?arrow_forwardHow is recrystallization of an impure solid accomplished?arrow_forwardBriefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.arrow_forward
- In a recrystallisation, why are the newly formed crystals washed with cold solvent? -To wash off any impurities that have crystallized on the surface of the pure crystals. -To wash off the film of solvent which contains the impurities. -To cool down the crystals. -To slightly dissolve the crystals to give them a more rounded shape.arrow_forwardBased on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?arrow_forwardSublimation is preferred for small scale purification as compared to crystallization because there is little loss of material during transfer True, sublimation guarantees a 100% yield False, the crystallization process is better because it yields a much purer product especially in small scale purification processes True, sublimation has less loss of material because the process has no intermediate liquid stage False, sublimation is better for large scale purification processes.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole
Macroscale and Microscale Organic Experiments
Chemistry
ISBN:9781305577190
Author:Kenneth L. Williamson, Katherine M. Masters
Publisher:Brooks Cole