Lab Report- Recrstalization and melting point

To determine the soil distribution coefficient (Kd), 10 g of dry soil is spiked with 100 mg of ring-labeled 14C-atrazine, 10 mL of deionized water is added, and the system is shaken for 24 hours. The aqueous and solid phases are separated, and the solid phase is extracted with 50 mL of methylene chloride while the aqueous phase is extracted with three successive 5 mL portions of methylene chloride. The atrazine concentration in the 50 mL of soil extract is 10 mg/L, and the concentration in the combined 15 mL from the aqueous extractions is 0.4 mg/L. Based on this information, calculate Kd.

3C Sodium benzoate, naphthalene, and analine are present in a solid mixture. Propose a detail separation scheme to isolate these three compounds as solids. Below is a list of reagents available in lab. You may use any of these given reagents (e.g., acids, bases) as needed in your separation scheme and you also have access to a solvent evaporator if a solvent must be evaporated, and a filtration apparatus to filter. Be specific in each reagent name and technique used in your separation scheme. + ● 10% aqueous NaOH 5% aqueous NaHCO3 6 M HCI 5% HCI O Na+ sodium benzoate naphthalene Saturated sodium chloride Diethyl ether anhydrous Na₂SO4 Anhydrous MgSO4 -NH₂ aniline

What method of separation would you use to isolate compound B from an ether solution containing a mixture of the two compounds below? OH A B Extract with base, isolate the aqueous layer, neutralize with acid, filter the precipitate and dry Extract with acid, isolate the aqueous layer, neutralize with base, filter the precipitate and dry Extract with base, isolate the organic layer, dry with magnesium sulfate, and evaporate the solvent Extract with acid, isolate the organic layer, dry with magnesium sulfate, and evaporate the solvent Extract with base, isolate the organic layer, neutralize with acid, filter the precipitate and dry Extract with acid, isolate the organic layer, neutralize with base, filter the precipitate and dry

A 1.5 L of organic compound solution contain 8.0 g of benzoic acid. Methyl tert-butyl ether (MTBE) solvent was used to extract the benzoic acid from the organic compounds into a diluted sodium bicarbonate solution via liquid-liquid extraction (LLE) method. The extracted benzoic acid was transformed into sodium benzoate aqueous solution after LLE. Calculate the total amount of the analyte extracted if the LLE process performed with 1:3 ratio for 3 times, with the recovery of 40% for every step. c)

Mixture of 0.7 g of Toluene and 0.3 g of CH3CH(CH3)2 CH2OH was separated using extraction. What is the Ether suitable solvent Which component will be СНЗСНІСН3)2 СH2C separated in aqueous layer Which component will be Toluene separated in organic layer II >

19. A liquefied mixture of n-butane, n-pentane, and n-hexane has the following composition: n-C,H10 50%, n-C,H12 30%, and n-C,H14 20%. For this mixture, calculate: a) The weight fraction of each component. b) The mole fraction of each component. c) The mole percent of each component. d) The average molecular weight of the mixture.

Discuss the purity of Acetanilide before and after crystallization based on melting points. Discuss the percent recovery after crystallization. Is water a good solvent for recrystallization ?

Can u please answer this question

Given a mixture of benzoic acid, 2-naphthol and p-dimethoxybenzene in t-butyl methyl ether. Using the following reagents: NaHCOs, NAOH and HCI. Draw a flow chart showing: a) How to separate the three components of this mixture? b) Identify the aqueous and organic layers in each step. c) Identify the number of extraction step.

You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.Your colleague is helping you develop the urine test. They suggest that the urine should be adjusted to a pH above 7 before extracting with the organic solvent. Why is this necessary? Support your explanation with a full arrow-pushing mechanism for the reaction that would occur if the pH was below 7. Include all formal charges, intermediates (if applicable) and products.

Imagine you are an organic chemistry student who isolates a crude sample of salicylic acid following the Unit 2 experiment, and then you recrystallize that sample in an attempt to purify it. After a week of drying in the hood, you analyze the recrystallized product by melting point to determine purity. You divide the recrystallized product into two MP capillary tubes. You analyze Sample 1 fırst and then dispose of the tube and sample. After the MP apparatus has cooled, you then analyze Sample 2. You record the following data in your lab notebook: The reported literature value for pure salicylic acid is 159 °C. Sample 1 start = 157.5 °C Sample 1 end = 160.5 °C Sample 2 start = 157.3 °C Sample 2 end = 158.8 °C Using all these data, draw a conclusion about the purity of your sample (i.e., "it is pure" or "it is not pure") and explain or support your conclusion. Also provide any hypotheses you have regarding all of these data. Avoid phraseology/words such as "I feel..." or "I believe..",…

Using chemical structures, illustrate the differences in weak intermolecular interactions that would occur between both propane and 1-propanol and Carbowax 20M, a polyethylene glycol material. Draw a structure of the polyethylene glycol material to illustrate these interactions. Which of the two compounds do you expect to have longer retention time? Explain.

percentage recovery of benzoic acid is 77.18%. The melting point range of crude benzoic acid = 112-119°C and the melting point range of pure benzoic acid (crystals) = 122-125. Comment on the percentage recovery of benzoic acid. Comment and compare the melting point of the crude and crystal samples

5 g of cobalt carbonate and 13 mL of concentrated hydrochloric acid were used. In another glass, prepare a solution with 8.4 mL of anhydrous ethylenediamine and 2.8 mL of concentrated hydrochloric acid. They are mixed and added and 6.5 mL of peroxide were added to it.30% hydrogen, thenconcentrated hydrochloric acid is added, followed by60 mL of ethanol. 5.1234 g were obtained orange solid [Co (en) 3] Cl3 What is the percentage yield of the reaction. The reactions are shown in the images.

During an assay of paracetamol by UV an analyst prepares a series of calibration solutions containing approximately 3-15 mcg/mL paracetamol as follows: 140.1 mg of pure paracetamol was added to a 200 mL volumetric flask.   0.1 M NaOH (50 mL) was added, the mixture well shaken and made up to volume with deionized water 10 mL of the above solution was diluted to 100 mL   1)What is the concentration of the final diluted solution in mcg/mL?(1 decimal) 2) What volume of the diluted solution is required to prepare 100 mL of a 8 mcg/mL standard solution? (1 decimal)

Which solvent would be the best choice for use as an extraction solvent in a separatory funnel with an aqueous solution of NaHCO3 followed by rotoevaporation?  Hint: Consider the ability of the solvent to dissolve a wide range of substances, its miscibility with water, and its ability to evaporate the solvent easily by rotoevaporation.     ethanol     hexane     toluene     ethylene glycol      methylene chloride

Please help me with this, I am trying to prepare for my final exam next week and I am just completely lost

A mixture is made up of low molecular weight carboxylic acid, alcohol and ester. What one step procedure can you use to extract the ester component from the mixture? Describe the process briefly

An unknown sample of alcohol is tested with Lucas reagent (ZnCl2 + HCI). An insoluble cloudy layer is observed immediately in 15 seconds. Identify the unknown sample of alcohol CH,CH,CHCH,CH,CH, он CH2 H3C CH,CH,CHCH,OH ČH, он CH3 H3C. CH3 CH--CH;-CH2-CH,-OH

Your employer hands you a heterogeneous mixture and asks you to isolate all of thehexane that you can from it. After some analysis, you determine that the mixture contains toluene, hexane,benzoic acid, water, sodium chloride, and sand. Explain how you would isolate pure hexane from thismixture. Remember that you can use techniques such as filtration, extractions, and acid/base chemistrythat we learned earlier in this course in addition to distillation. You may need to look up solubilities and/orboiling points online to solve this problem. You only need to isolate the hexane?

A 532 mg of a mixture of fluorene and benzoic acid was weighed out and subjected to an extraction and recrystallization. After this purification was completed the product crystals were dried and analyzed. The purification procedure produced 174 mg of fluorene and 249 mg of benzoic acid. Calculate the percent composition of this mixture.

A student use the same protocol as in the lab manual to extract 4 chloroanilline, benzoic acid and naphthalene. Below are the steps he took Step 1 - Dissolve all three in 15 ml ether and place in separatory funnel Step 2- Add 15 ml of hydrochloric acid and mix well Step 3 - Isolate the aqueous layer and add sodium hydroxide which resulted in a precipitate Step 4- Add 15 ml of sodium carbonate to the ether layer and mix Step 5- Isolate the aqueous layer and add hydrochloric acid, which resulted in a precipitate. Step 6- dry the ether layer and collect the solid that is left

Extraction of Caffeine Post-lab   8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you useethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane asthe extraction solvent)? Explain why or why not. 9. A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL(1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL? Showyour work. 10. What is an alkaloid?

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correct this scheme and highlight what needs to be corrected