Q: Experiment - Recrystallization Weight of crude acetanilide % yield Weight of pure acetanilide 2.2 g…
A: Percent Yield: Percent yield will generally be calculated by the utilization of actual mass and…
Q: Indicate the order in which the following compounds would be eluted from an HPLC column containing a…
A: As per bartleby guidelines we solved first question for you. Please find the below attachments.
Q: In kool aid chromatography, why does reducing the dilution of 2-propanol result in its decrease in…
A: In Kool aid chromatography, different colored dyes are separated using a mobile solvent phase and a…
Q: Which compound from each pair would be collected first when purifying a mixture using column…
A: We know that
Q: Briefly explain the thin-layer chromatographic purity check procedure for analysis of an unknown…
A: The combination of two or more components with or without a specific molar ratio results in a…
Q: standardization
A: We know that internal standardization is a more effective technique than external standardization…
Q: Consider the chlorination (Cl2, hν) of optically active (2R,3R)-2-chloro-3-methylpentane. If the…
A:
Q: 1,8-Cineole is a predominant terpene found in cranberries. The concentration of 1,8-cineole in…
A: Concentration of 1,8 cineole is calculated as given below.
Q: . In the solution step, an unnecessarily large volume of solvent is used. i. Effect on…
A: Recrystallization is the purification technique. In this technique, the hot solvent is used to…
Q: Two weak acids, HA and HB, have K4 values of 1.0 E-6 and 3.0 E-4. Their partition coefficients…
A: Given :-HA⇌H++A- Ka=1x10-6 KHA=12.2HB⇌H++B-Ka=3x10-4 KHB=8.3Ka=H+A-HA=A-HA=KaH+Distribution ratio…
Q: If 100 ml of a 1:1500 methylbenzethonium chloride lotion is diluted with an equal volume of water,…
A:
Q: 3. The video above actually makes cyclohexene from cyclohexanol rather than 4- methylcyclohexene…
A: Distillation is the process of separating the components or substances from a liquid mixture by…
Q: Suppose we start with 3.0g of contaminated benzoic acid. After recrystallisation we end up with 2.3g…
A: Given Mass of contaminated benzoic acid = 3.0 g Mass of pure benzoic acid = 2.3g
Q: b. Can a mixture of d- and l-carvone be separated by column chromatography on silica gel using…
A: d-carvone and l-carvone are enantiomers of each other and are a class of monoterpenes found in…
Q: Using a burette, measure the cyclohexene (6.0 mmol) and transfer to a 125 mL erlenmeyer, along with…
A: Concentration of a solute is defined as the amount of solute present per unit amount of solvent. It…
Q: How might cyclohexane give a false positive when choosing a solvent for recrystallization?
A: Melting point of cyclohexane = 6.47 oC Cyclohexane is not soluble in solvent at high temperature,…
Q: A 25 g of butyric acid was extracted with 400 mL ether from 400 mL water (Kd=3.0 at 25 °C) Using…
A: Let, Vml of ether solution containing W gm of butyric acid solute be repeatedly extracted with v ml…
Q: We perform a 1.0 mL 2-methyl-2-butanol alcohol dehydration by simple distillation also using H2SO4.…
A: A question based on analytical separations that is to be accomplished.
Q: Calculate the weight of nitrobenzene that codistills (bp 99°C) with each gram of water during a…
A: When two mutually immisicible liquids are mixed to give a heterogeneous mixture, each exerts its own…
Q: The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is (a)…
A: 1. (c): The o- and p-nitrophenols are separated by steam distillation since o-isomer is steam…
Q: Given that Grignard reaction used 1.4555 g of phenyl bromide 10 g of carbon dioxide , 0.5734 g of…
A: Answer Theoretical yield = 1.1321 g Percent yield = 50.61 % Given: Mass of Phenyl bromide…
Q: Laboratory #1 Isolation of Carvone and Limonene from the Oil of Spearmint/Caraway Introduction The…
A: TLC is an analytical technique which can be used to monitor the organic reaction transformations.…
Q: The distribution coefficient, k for a compound “A” between hexane and water is 7.5. What weight of A…
A:
Q: 1. Which is a false statement regarding solid-phase synthesis?
A: A solid phase synthesis is a heterogeneous reaction technique in which a reagent reacts with the…
Q: When a solution of 1.00 g of X in 100 cm3 of water was shaken with 10 cm3 of ether, 0.80 g of X was…
A: Formula used w = W KD×VKD×V+ vn Where KD = distribution coefficient V = Volume of water = 100 cm3 =…
Q: 1-A bottle of Na2EDTA.2H2O is labeled with an assay of 100.5%, what is this implied? What is the…
A: Purity of substance- Pure substances are those which are made up of only one type of atoms or…
Q: Why sometimes derivatization is used in the sample preparation for GC-MS?
A: The role of derivatization in GC-MS is given below
Q: relative abundance of very close to 1:1. The other had M+ of 112 and M+2 of 114 with a ratio of…
A: Here we are required to provide explanation as bromination of benzen using FeCl3 produces Two…
Q: A) In the following synthesis reaction, thoroughly explain which compound would be the most suitable…
A: WILLIAMSON ETHER SYNTHESIS: The given reaction is an SN2 reaction in which ether is formed as a…
Q: (b) Describe the change in composition of the solution containing a mole fraction of 0.10 A as the…
A: TLC spot is spotted always above the developing solvent level
Q: 19. What is thin layer chromatography (TLC) LEAST useful for from the list below? A) To determine if…
A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: 4. What is the purpose of changing the eluting solvent from pentane to ether between the two…
A: "Since there are multiple questions and it is not mentioned that which one has to be solved so I am…
Q: When 1.06 mmol of pentan-1-ol and 1.53 mmol of hexan-1-ol were separated by gas chromatography, they…
A: CONCEPT: Once response factor is calculated, we can calculate the concentration of the unknown using…
Q: Let's assume that 5.6 g of crude product was isolated, and 4.19 g of pure product was collected…
A: Melting point of crystal depends on arrangement of lattice
Q: 10. (a) Remember the structures of cis- and trans- 1,2-dibenzoylethylene. Which diastereomer would…
A: Trans 1,2-dibenzoylethylene would have a greater affinity for the polar mobile solvent.
Q: (Submit your answers on a separate sheet if necessary.) 1. If some of your unknown sample failed to…
A: These Questions are related to the effect of the error on experimental data calculation.
Q: What is the order in which the following compounds would he eluted from an HPLC column containing a…
A: To find: The order of elution of the given compounds in HPLC
Q: Chemistry Two unknown compounds A and B with the chemical structures below are separated on a…
A: Chromatography is the technique which is used to do the separation of components from the…
Q: Nitroethylene, H,C-CHNO, is a sensitive compound that must be prepared with great care. Atempted…
A:
Q: You are about to purify an impure sample of naphthalene by column chromatography. What solvent…
A: Column chromatography is an analytical method used for the separation of a compound from the mixture…
Q: Solvent front Isolated product Reagent B Reagent A
A: From the TLC plate we can see that for reagent B two spots are observed. So the reagent B is not…
Q: In a Grignard reaction, 1.4555 g phenyl bromide, 10. g carbon dioxide, 0.5734 g magnesium filings,…
A: Given- 1.4555 g = phenyl bromide 10. g = carbon dioxide 0.5734 g = magnesium filings 30.2 mL of 6M…
Q: is hexane or 70:30 hexane: ethyl acetate a better eluent based on their TLC plates and rf value in…
A: Misciblity is main factor which determine that which solvent are best eluent based on their TLC…
Q: Explain why it is needed to filter the solvent before introducing it to the HPLC system
A: Basically there are following two reasons for using filtration during HPLC sample preparation are…
Q: 7. The following is a gas chromatogram for a sample containing compounds B, and C. area A = 75 area…
A: In gas chromatography, the individual compounds of a mixture are separated by the variation in the…
Q: Two compounds A and B from GC on two open tubular columns contains a XY-1 (100% methyl) and a XY-2…
A: In gas chromatography, a more polar group interacts more with the stationary phase (usually silica…
Q: Do compounds always elute in the same order on a TLC plate and on a chromatography column? Why or…
A: Once in a while, rather than letting the eluent go through the segment by means of gravity, the…
Q: 2) Consider the following compounds. Which rankings list these compounds in terms of Ry from lowest…
A: Thin layer chromatography.
Q: Explain the possible behaviour and extractability of these compounds using sample extraction…
A: "Since there are multiple sub-parts in this question and it is not mentioned that which one has to…
Give two reasons and explanations why cyclohexane, m.p=25 c and b.p= 161 c would not be a suitable solvent for recrystallization.
Step by step
Solved in 2 steps
- Cis-3-hexene and trans-3-hexene can be separated and analyzed using GC without injecting an equimolar standard to a high accuracy. Explain why that is the case for these two compounds while we had to inject an equimolar solution for our experimentWhy is distillation of cyclohexanol using acid catalyst phosphoric acid a better technique to purofy rather than extraction, recrystallization, chromatography, IR spectroscopy?SEE PHOTO: Effectiveness of separation. Based on the TLC analysis, did the isolated benzoic acidappear pure relative to the starting mixture? Did the isolated naphthalene look pure?How could the purity of the isolated materials be improved? In the picture: Aq- is Benzoic acid O- is Naphthalene both- is both Benzoic acid and Naphthalene
- Propose a extraction flowchart capable of seperating this mixture into its pure formThe literature value for the melting range of a pure compound is 113-115o C. What is the expected experimental melting range of that recrystallized compound immediately after being isolated from the Buchner funnel before drying completely? Explain.Why sometimes derivatization is used in the sample preparation for GC-MS?
- When a solution of 1.00 g of X in 100 cm3 of water was shaken with 10 cm3 of ether, 0.80 g of X was transferred to the ether layer. How much would have been extracted into the ether layer if we had shaken the original solution of 1.00 g of X in 100 cm3 of water with just 5 cm3 of ether?Two weak acids, HA and HB, have K4 values of 1.0 E-6 and 3.0 E-4. Their partition coefficients between water and ether are 12.2 for HA and 8.3 for HB. How many extractions are required (using Vether/V water = 1) for the removal of HA (more than 99% from an aqueous solution, while retaining HB (≥ 99%) in the aqueous solution.What will be the composition of the vapor when a mixture containing 0.30 of A was subjected to fractional distillation with two theoretical plates? a 0.72 A; 0.28 B b 0.87 A; 0.13 B c 0.50 A; 0.50 B d 0.30 A; 0.70 B
- Why is the final product from recrystallization isolated by vacuum filtration and not by gravity filtration?Assuming that either solvent is otherwise acceptable in a given instance, what advantages does ethanol have over 1-octanol as a crystallization solvent? Hexane over pentane? Water over methanol?2. Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed. (a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering. (b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM. (c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. (d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3. (e) You neutralised the NaHCO3 solution to pH7 rather than pH2.