Predict the order of elution of the following compounds from a GC column packed with polyethylene glycol: hexane, heptane (b.p. 98oC), octane (b.p. 126oC), benzene (b.p. 80oC), butanol (b.p. 117oC), 2-pentanone (b.p. 102oC)
Q: 4. At 25 °C, 1.0 g of caffeine will dissolve in 47 mL of water, in 8.1 mL of chloroform, in 86 mL of…
A: The solubility of caffeine in g/100mL in each of the solvents can be calculated as:
Q: Look up the pKa values for trimethylamine, dimethylamine, methylamine, and ammonia. Predict the…
A: pKb tells about the basicity of any organic base. Higher the pKb value, lower would be the basicity.
Q: Briefly outline the experimental procedure used in obtaining the data required for External-Standard…
A: A question based on tools in analytical chemistry that is to be accomplished.
Q: Solute A has a partition coefficient of 3 between toluene and water, with three times as much in the…
A: This topic comes under solvent extraction. We will use the following formula, The fraction in Phase…
Q: The following data were obtained for four compounds separated on a 20-m capillary column. t, (min) w…
A:
Q: The partition coefficient K for a compound between dichloromethane and water is determined to be 56…
A: We have to predict the volume of solution remaining in Water.
Q: Suppose you have 0.01moles of an organic solid in 100ml of water. The partition coefficient P…
A:
Q: A solute is added to a water- benzene mixture and mixture and shaken vigorously. 25ml benzene layer…
A:
Q: 6. If there is one monolayer coverage of organic contamination on the wafer, how much is that…
A: In order to solve this question, we will be substituting one silicon atom with a carbon atom on the…
Q: Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are…
A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…
Q: Predict the order of elution of benzyl alcohol (C6H5CH2OH), benzaldehyde(C6H5CHO), benzoic acid…
A: Elution is dependent on the polarity of the compound. They are inversely related to each other. If…
Q: c) diethyl ether. After separating the layers, 240 mg of cyclohexanol are recovered from the diethyl…
A:
Q: The distribution coefficients for a compound are as follows: Kcyclohexane/water = 1.5 Kpentane/water…
A: Distribution coefficient is the measure of efficiency of extraction of organic compounds. Compounds…
Q: The partition coefficient for caffeine between dichloromethane and water is 4.6. Assume that a 100…
A: The partition coefficient gives the proportion of the concentration of solute dissolved in two…
Q: You add 1 mL of sample and collect 1 mL fractions from a column with a volume of 20 mL where the…
A: Ans:- Given: column size is 20ml , sample loaded is 1 ml. Now, we see that the partition coefficient…
Q: Grams of tea = 3.51g Beakers weight =28.50g Caffeine's weight + beaker = 36.72g (before…
A: Given data: Grams of tea = 3.51 g Beaker's weight = 28.50 g Caffeine's weight + beaker = 36.72 g…
Q: A monoprotic acid (HA) with a Ka of 1.62 x 10-³ has a partition coefficient of 9.0 (favoring hexane)…
A: Given: Ka = 1.62 ×10-5 Partition coefficient, K = 9.0 At pH = 6.55 pH = -log[H+]…
Q: Trichloroethylene (TCE) is a chlorinated solvent with an octanol-water partition coefficient, log…
A:
Q: The interaction between a basic analyte and the residual silanol groups of the stationary phase is…
A: When pH of mobile phase is equal to pKa of silanol then its proton will get deprotonated and basic…
Q: Compare the diffusion coefficients of carbon in BCC and FCC iron at the allotropic transformation…
A: The relation to calculate the diffusion coefficient of carbon in BCC or in FCC using Arrhenius type…
Q: A solute with a partition coefficient of 4.0 is extracted from 10.0 mL of phase 1 into phase 2. a)…
A: Given information - partition coefficient, K = 4.0 Volume of phase 1, V1 =10.0 mL Volume of…
Q: For a normal phase separation, predict the order of elution of the following compounds a. n-hexane,…
A: Polarity is the property of having differences in electronegativity. If there is a difference in…
Q: A 72.0 g sample of an organic solid is dissolved in 180mL of water. The solid is extracted using one…
A: A question based on analytical separation that is to be accomplished.
Q: Explain the difference in nephelauxetic effect of the Racah parameter (B) for [Co(CN)6]3- = 460 cm-1…
A: From the given data we need to find the difference in nephelauxetic effect for Co(CN)63- and…
Q: It can be shown mathematically that 2 or more smaller extractions (using smaller portions of a…
A:
Q: 2. (a) Calculate the partition coefficient K of theanine in diethyl ether/water, benzene/water and…
A: The distribution constant or the equilibrium constant, K is called the partition coefficient which…
Q: If you are using a NORMAL phase HPLC, predict the order of elution of 1. n-hexane, n-hexanol and…
A:
Q: Paraxylene, styrene, toluene, and benzene are to be separated with the array of distillation columns…
A: Accordingto the given Diagram, where F, D, B, D1, B1, D2 and B2 are the molar flow rates in…
Q: (b) A 2.000 g of an organic compound X was dissolved in 50.00 mL of dichloromethane. This organic…
A:
Q: 10.Consider synthesis of nylon-6,10 from stoichiometric amounts of hexamethylene diamine,…
A: To Find: To determine the aMn and Mw of nylon-6, 10
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: Answer:- This question is answered by using the simple concept of calculation of partition…
Q: Predict the major fractions of this molecule in GC/MS:
A: The chemical formula of the given compound: C27H33NO2 The exact mass of the given structure: 403.25…
Q: Describe the components of a filter fluorometer and a spectrofluorometer. Why are fluorometers…
A:
Q: How would you expect your plot of Pvap vs. T (°C) to differ if you had examined methanol instead of…
A: Vapor pressure is the measure of how much a substance is prone to go to the vapor state. To compare…
Q: A student performed the fractional distillation of a cyclohexane/toluene mixture. The refractive…
A: Mole fraction is the ratio of moles of solute to that of total moles of solution. Mole percentage of…
Q: A 36.0 mg sample of an organic compound (molar mass = 84.0 g/mol) is dissolved in 10.0 mL of water.…
A: Given:Mass = 36.0 mgmolar mass = 84.0 g/molVolume of water = 10 mLMass of Organic compound after…
Q: The partition coefficient, Kp. at 25°C (1.e., room temperature) for compound A is 9.71 (for water…
A:
Q: Indicate the order of elution in which the following compounds would be eluted from an HPLC column…
A: Concept: In reversed phase packing HPLC more polar compound will elute first. So we have to know the…
Q: 4. For the system in question 2, estimate tlGo for micellization if the molecular weight of the…
A: Gibb’s free energy (∆G)– Formula is, ∆G=∆H-T∆S Where, ∆G= Gibb’s free energy ∆H=change in…
Q: Using thin-layer chromatography showed that the black dye used in a brand of writing ink contained…
A:
Q: Explain the formation and importance of the electric double layer in the context of disperse…
A:
Q: The following explains why TLC is done in a closed container EXCEPT: • To maintain the concentration…
A: The solution is given below -
Q: The weight percent %W/W of a saturated solution of potassium chloride in 20CO was: (NOTE: the…
A: Given, mass of the solution = 298g Mass of KCl or mass of solute = 74.5531 g Formula for % w/w is…
Q: 12 The following results were obtained in an experiment to determine spermine by high performance…
A:
Q: One gram of a compound requires the following quantities of solvent to dissolve: 47 ml of water, 8.1…
A:
Q: Indicate the order of elution of the following compounds from a normal-phase packed HPLC column a.…
A: Several compounds mixed in any particular solution mainly separated by utilizing the technique…
Q: state the three different modes of GC/MS, and explain more for each.
A: GC-MS refers to Gas chromatography-Mass spectroscopy. It is an analytical method that combines the…
Q: The absorbance of a 0.5 mM aqueous salicylic acid solution was 0.925. This solution was extracted…
A:
Predict the order of elution of the following compounds from a GC column packed with polyethylene glycol:
hexane, heptane (b.p. 98oC), octane (b.p. 126oC), benzene (b.p. 80oC), butanol (b.p. 117oC), 2-pentanone (b.p.
102oC)
Trending now
This is a popular solution!
Step by step
Solved in 4 steps
- 10.Consider synthesis of nylon-6,10 from stoichiometric amounts of hexamethylene diamine, H2N(CH2)6NH2, and sebacic acid, HOO(CH2)8COOH. At 98% conversion of carboxylic acid groups, determine (a) Mn and Mw of the product, and (b) the sum of the mole fractions and that of the weight fractions of species containing 1 through 6 (inclusive) monomer units.How would you expect your plot of Pvap vs. T (°C) to differ if you had examined methanol instead of ethanol? Explain your answer.Indicate the order of elution in which the following compounds would be eluted from an HPLC column containing a reversed-phase packing: (a) benzene, diethyl ether, n-hexane (b) propylene, hexane, benzene, dichloro-benzene
- (h) Describe a chromatographic technique that could be suitable for studying the molecular weight distribution of poly(phenylenevinylene) derivatives that are soluble in organic solvents. Explain the physical basis on which separation could occur and suggest how the polymers could be detected after elution.Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: (a) 2-octanol; (b) 1,3-dichlorobenzene; (c) tert-butylcyclo hexane; (d) benzoic acid.Indicate the order of elution of the following compounds from a normal-phase packed HPLC column a. ethyl acetate, acetic acid, dimethylamineb. propylene, hexane, benzene, dichlorobenzene
- The solubility of Lorazepam (a tranquilizer found in Emotival , Lorax, Wypax, and other prescription medicines) is 0.08mg/mL and 2.62mg/mL, in water and chloroform, respectively. Estimate the partition coefficient of lorazepam between chloroform and water. 3. The solubility of benzoic acid at 25 degrees Celsius in water and diethyl ether is 3.35 mg/mL and 0.353 g/mL, respectively. Estimate the percent recovery of benzoic acid in the organic phase, if a solution of benzoic acid in water is extracted with an equivalent volume of ether. [HINT-pay attention to the units] 4. The solubilities of cholesterol in water and chloroform are 0.550mg/100mL and 1.00g/5.25mL, respectively. Estimate the partition coefficient of cholesterol between chloroform and water. [HINT- units] What conclusion can be drawn about the polarity of cholesterol?Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425 Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425a. Calculate the retention factor for each soluteb. Calculate the selectivity factorc. How many plates are needed to provide a resolution of 1.5?d. What column length should be used to provide a resolution of 1.5 if the plate height ofthe packing is 1.5 ×10-3 cm?e. If the flow rate is 6.75 cm min-1, how long will it take to elute the two species?A solute is added to a water- benzene mixture and mixture and shaken vigorously. 25ml benzene layer contains 0.1g solute and 25ml water layer contains 0.25g solute. What is the value of distribution coefficient or partition coefficient?
- 1. It can be shown mathematically that 2 or more smaller extractions (using smaller portions of asolvent) are better than 1 single extraction using a larger portion of solvent. Suppose a particularextraction proceeds with a partition coefficient, Ksp, of 10. Ksp = C2/C1 where C2/C1 is the distribution of a compound between diethyl ether (C2) andwater (C1) in grams/L. Use grams/L in your calculations. 5.00 g of an organic compound is dissolved in 100 ml of water. Show that two successive 50.0 mlextractions with diethyl ether will yield more compound than one 100 ml extraction.Look up the pKa values for trimethylamine, dimethylamine, ethylamine, and ammonia. Predict the order of elution of these compounds from a cation-exchange column eluted with a gradient of increasing pH, beginning at pH 7.There is a class of polyesters that have the general structure shown below. For example, in polyethylene terephthalate (PET) m =1. How would you expect the Tg ad Tm of these polymers to vary with m, given that the molecular weight of the chain is held constant? Give reasons for your answer. Also, assuming that you are now just considering one member of this class of polymers, say PET, how does the Tg vary with molecular weight, n.
