Post Lab Question: (Seperation of Benzoic Acid from Biphenyl, Crystallization and IR) Why is the beaker...
Post Lab Question:
(Seperation of Benzoic Acid from Biphenyl, Crystallization and IR)
Why is the beaker containing the bicarbonate extracts cooled before adding HCl?
Homework Answers
The reaction between bicarbonate and HCl is an acid base neutralisation reaction. Such reactions are exothermic in nature. Lot of heat is liberated in the process. Hence, the beaker containing the bicarbonate extracts is cooled before adding HCl so that the heat liberated can be absorbed by cold solution.
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Post Lab Question:
(Seperation of Benzoic Acid from Biphenyl, Crystallization and
IR)
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seperation of acid neutral
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QUESTION: Write a flow scheme for the work-up. THE WORK UP:
QUESTION:
Write a flow scheme for the work-up.
THE WORK UP:
C. Work-up (save all layers) and Isolation of Product MgBrCl Benzoic acid Transfer the mixture into a test tube. Rinse the beaker with about 3 mL of regular (not anhydrous) diethyl ether and pour the washings into the test tube. There should be two distinct layers in the test tube Remove the aqueous layer (to be discarded) and shake the ether layer with about 2 mL of 3 M...
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Post-Lab Questions 27. Why was it necessary to wait until almost all of the l2 formed had reacted...
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Post-Lab Questions 27. Why was it necessary to wait until almost all of...
3. Crystallization begins with a process called nucleation, where particles of the substance dissolved in solution...
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Post lab Exp 10: Preparation of benzil from benzoin Place 1 g of benzoin and 3...
Post lab
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seperation of acid neutral
Experiment 5: Separation of Acid-Neutral Mixture Post-Lab Questions 1. Draw and label the structures of the major and minor components of the acidic and neutral mixtures. 2. Although acetic acid - water may be used as a "solvent pair", why are dilute solutions of an inorganic acid/water (or, inorganic base/water) avoided in recrystallization attempts? (Hint: see Wade Ed: Sections 21-12, 21- 13. Consider functional-group possibilities.] 3. Using a flow diagram, show the separation of a mixture...
QUESTION:
Write a flow scheme for the work-up.
THE WORK UP:
C. Work-up (save all layers) and Isolation of Product MgBrCl Benzoic acid Transfer the mixture into a test tube. Rinse the beaker with about 3 mL of regular (not anhydrous) diethyl ether and pour the washings into the test tube. There should be two distinct layers in the test tube Remove the aqueous layer (to be discarded) and shake the ether layer with about 2 mL of 3 M...
Post-Lab Questions 27. Why was it necessary to wait until almost all of the l2 formed had reacted with the thiosulfate being added before adding in the starch indicator? 28. If KIO, is a primary standard, why didn't you just weigh out solid KI Os for each trial in the same he primary standard potassium hydrogen phthalate for an acid-base way you would do for t titration?
Post-Lab Questions 27. Why was it necessary to wait until almost all of...
3. Crystallization begins with a process called nucleation, where particles of the substance dissolved in solution begin to aggregate. Crystals then begin to form on these aggregates. Based on this, explain why Steps 3 and 4 in Part III may induce crystallization. Part II: Observations Upuy Describe qualitative changes to solution - Solution went from bright yellow, orange to a mare dacu Orange /ced - hydrogen peroxide is originally clear but tuck's oldcu in the solution. The addition of hydrogen...
Post lab
Exp 10: Preparation of benzil from benzoin Place 1 g of benzoin and 3 mL of concentrated nitric acid in a 50 mL beaker. Heat the mixture on a water bath for 15 minutes. At the end of this time, add 30 mL of cold water to the reaction mixture. Cooling the reaction mixture in ice-water bath will cause crystallization. Vacuum filter the product. Press the crystal gently with a clean glass stopper to remove as much of...
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