2) (4) Successful recrystallizations involve several steps, each which must be carried outcorrectly. For the setups mentioned below identify whether the technique is correct labprocedure. If so, briefly explain why. If not, what is the correct procedure?a. Solute to be recrystallized is dissolved in liberal amounts of hot solvent and placedimmediately into an ice bath to crystallize.b. Some black particles remain in the solution despite the addition of more hotsolvent, so the solution is put through a hot gravity filtration, cooled and vacuum filtered.

a. Incorrect ProcedureExplanation: Dissolving the solute in liberal amounts of hot solvent goes…

Answered: 2) (4) Successful recrystallizations…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter5: Distillation

Section: Chapter Questions

Problem 7Q: In fractional distillation, liquid can be seen running from the bottom of the distillation column...

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In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask. What effect does this returning condensate have on the fractional distillation?
5. a. Data were collected for Trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclo- hexane. Complete the table for the analysis (See Report Sheet). Record calculated values with the correct number of significant figures. B. Freezing Point of Cyclohexane plus Calculation Zone Unknown Solute 2. Mass of cyclohexane (g) 10.14 Part C.4 3. Mass of added solute (g) 0.255 C. Calculations 1. k; for cyclohexane (°C⚫ kg/mol) 20.0 2. Freezing point change, AT, (°C) 3.04 Part C.6 3. Mass of cyclohexane in solution (kg) 4. Moles of solute, total (mol) Show calculation. 5. Mass of solute in solution, total (g) 6. Molar mass of solute (g/mol) Show calculation.
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?
hello ! i need help with 6,7,8
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.
Name: Date: Section: Prelaboratory Assignment: Determination of Molecular Weight Through Freezing Point Depression Analysis 1. What is the vapor pressure at 20°C of a solution of 3.50 g of naphthalene C,H; in 25.0 g of benzene (v.p. pure benzene = 74.7 mm Hg at 20°C) %3D lution of 25 mL, of CH.OH (d= 0.792 g/ml) in 325
7- Place the stopper on the volumetric flask and mix the solution thoroughly by inverting and shaking the flask. Don't add water to a level above the line on the neck of the flask. beaker balance $4.68 stirrer bar 6 volumetric flask C D Conclusion: state the concentration of your solution. E E Analysis: a. Calculate the concentration of your solution. b. Why was it necessary to invert the volumetric flask? c. Why should the final solution be left stopper? d. If we filled the flask to above the line how would this have changed the concentration of the solution?
If no solid adipic acid is obtained after cooling for recrystallization, what would be a possible way to address this problem? O Add some more methanol as solvent O Try to seed the solution with a tiny crystal of pure adipic acid Evaporate some of the solvent in the hood and attempt the recrystallization process again O b and/ c
The solvent used in recrystallization could be Question 6 options: a mixture of two liquid; a pure solvent; all options are correct;
2. You need to make 500mL of 7H9(+) media with 1X ADN and 30ug/ml. of the antibiotic kanamycin. Your stock solutions are 10X ADN and 30mg/mL of kanamycin. The solvent is distilled water. How much of cach component will you need to make the desired final solution?
Hello! Please answer these three questions. Refer to the table above.
EXPERIMENT Determination of Molar Mass by the Freezing Point Depression Method 12 Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (ATf) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101 р. 101

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