Write TRUE if the BOLD word/phrase makes the statement correct. Otherwise, write the correct WORD/PHRASE that will make the statement true. If there are two bold words/phrases in a number, write your answer for EACH of the bold words/phrases. 1. The addition of excess charcoal would decrease the % recovery in the purification by recrystallization. 2. If the target compound is contaminated with impurity, the melting point will be higher than the theoretical value and the melting range is large.

Write TRUE if the BOLD word/phrase makes the statement correct. Otherwise, write the correct WORD/PHRASE that will make the statement true. If there are two bold words/phrases in a number, write your answer for EACH of the bold words/phrases. 1. The addition of excess charcoal would decrease the % recovery in the purification by recrystallization. 2. If the target compound is contaminated with impurity, the melting point will be higher than the theoretical value and the melting range is large.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter80: Crystallization: Purification Of Solids

Section: Chapter Questions

Problem 4P

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Which of these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.
Write TRUE if the underlined word/phrase makes the statement correct. Otherwise, write the correct WORD/PHRASE that will make the statement true. If there are two bold words/phrases in a number, write your answer for EACH of the bold words/phrases 1. 6-hydroxy-1-naphthoic acid is soluble in 5% NaOH and soluble in 5% NaHCO3. 2. The addition of excess charcoal would decrease the % recovery in the purification by recrystallization. 3. If the target compound is contaminated with impurity, the melting point will be higher than the theoretical value and the melting range is large.
Thin layer chromatography : When placed on a plate, the silica gel has a polar surface. Explain why. What intermolecular forces can form between the silica and the reference molecules? Name them.
Which statement is true? Statement 1: In chromatography, the compound mixture moves along with the mobile phase through the stationary phase and the components get separated depending on the degree of interaction and adhesion Statement 2: Compound A is more soluble in the mobile phase compared to compound B. Thus, compound A would most probably have a higher Rf value.
1. Cite one factor that affects percent yield during recrystalization. 2. Discuss the importance of solvent-solvent partition in separating mixtures.
Why is important to allow the saturated solution to cool down slowly during the recrystallization?
One of the problems that can be encountered in recrystallization is the failure of the solute to crystallize. In which of the following scenarios could that happen? a. Cooling the filtrate in an ice bath. b. Using a wide bore, long-stemmed funnel in the hot filtration step. c. Addition of too much water in the receiving flask. d. Washing the residue with cold solvent
Which of the following would cause a loss of yield and would also change the observed/measured ratio of the two salts? • salts that were not completely dry at the time of weighing • using tap water instead of deionized water • pouring the salt/water mixture into the funnel too quickly so that some of the undissolved solid slips underneath the filter paper and into the filter flask accidentally spilling some of the original salt mixture before adding water to dissolve the soluble salt • forgetting to use a watch glass when boiling so that some salt escapes during the boiling process
Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.
When you collected 50 mL of distillate in the collection flask, the mole percent of water in the distillation flask decreased to approximately 20 mole percent. 95 100 With your simple distillation set-up, what percentage of water will be in the vapor phase at this composition of the liquid? Read the theory page if you don't remember how to interpret the boiling point composition curve. a) 98 mole percent water b) 86 mole percent water c) 92 mole percent water d) 72 mole percent water
Pls do fast within 5 minutes and i will give like for sure Solution must be in typed form To plan a liquid–liquid extraction we need to know the solute’s distribution ratio between the two phases. One approach is to carry out the extraction on a solution that contains a known amount of solute. After the extraction, we isolate the organic phase and allow it to evaporate, leaving behind the solute. In one such experiment, 1.235 g of a solute with a molar mass of 117.3 g/mol is dissolved in 10.00 mL of water. After extracting with 5.00 mL of toluene, 0.889 g of the solute is recovered in the organic phase. If we extract 20.00 mL of an aqueous solution that contains the solute using 10.00 mL of toluene, what is the extraction efficiency?
Which of the following statements is true? A Liquids can be weighed using a weighing paper. B In weighing hygroscopic substances, containers should always be kept close when not in use. After drying a sample in the oven, you can place it immediately inside the analytical balance. D Place solid reagents / precipitates directly on top of the balance pan.