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- hree components in a mixture have varying distribution constants between the mobile phase and the stationary phass One of the components has a very low distribution constant, Would this component likely elute first or last and how would you design an experiment or modify the components of the separation to make it perform in the opposite manner?The partition coefficient of ammonia between water and chloroform is wanted to be determined. The necessary quantities of ingredients are taken into the separation funnel, and the extraction process is applied. At the end of the extraction process, 5 mL portions of each of the water and chloroform phases are titrated with 0.1 M HCI in the presence of methyl orange indicator. If the volumes spent at the turning points are 7.2 and 5.1 mL, respectively, calculate the KSU, KLOROFORM (Dispersion coefficient) value.Substances A and B with capacity factors 6.3 and 11.4, respectively, are being carried by a mobile phaseflowing at a velocity of 0.53 mm/s. What is the length of a column required to separate these two substanceswith a resolution of 1? Assume that the sample zones for both A and B broaden based on the van Deemter equation H = 0.35 + 0.48/u+ 0.57u where Hand u are expressed in µm and mm/s, respectively.
- The researcher extracts a sample of well water and prepares it for TXRF analysis with a 10.00 mg/L V internal standard, like the calibration standards. The result produces SCa = 69297.81 and SV = 13481.2.Determine the concentration of Ca.the following data were the results from six replicate determinations of iron in aqueous samples of a standard solution containing 20ppm iron (III) 19.8, 19.6, 19.5 ,19.4, 20.1, 20.3 DETERMINE THE MEDIAN FOR THE DATAThe absorbance of a 0.5 mM aqueous salicylic acid solution was 0.925. This solution was extracted with 10% ethyl acetate/hexane solution. The absorbance of the extracted aqueous salicylic acid solution at equilibrium was 0.670. Find the equilibrium concentrations of SA in the aqueous and the non-aqueous phases. Calculate the partition coefficient (K) for the salicylic acid.
- I need the theoretical molar extinction coefficient of paranitrophenol in mol^-1cm^-1 (using moles not μM). I have to calculate the % difference.At the experimental level it was 7,200 mol^-1cm^-1The mean activity coefficients of HBr in three dilute aqueous solutions at 25° C are 0.930 (at 5.0 mmol kg-1), 0.907 (at 10.0 mmol kg-1), and 0.879 (at 20.0 mmol kg-1). Estimate the value of B in the extended Debye-Hückel law, with C = 0.Explain the difference in nephelauxetic effect of the Racah parameter (B) for [Co(CN)6]3- = 460 cm-1 and [Co(NH3)6]3+= 615 cm-1.
- If 30.0 mL of water that is 0.0500 M in Q is to be extracted with four 10.0 mL portions ofan immiscible organic solvent, what is the minimum distribution coefficient that allowstransfer of all but 1.00 x 10–4 of the solute to the organic layer.A standard solution was prepared containing 10.0 ppm of an analyte and 15.0 ppm of an internal standard. Analysis of the sample gave signals for the analyte and internal standard of 0.155 and 0.233 (arbitrary units), respectively. Sufficient internal standard was added to an unknown sample to make it 15.0 ppm in the internal standard. Analysis of the unknown sample yielded signals for the analyte and internal standard of 0.274 and 0.198, respectively. Calculate the concentration of analyte in the unknown sample.1. Assume that the hydrocarbonlike interior cavity of the SDS micelle has a diameter of - 3 nm and that it contains three solubilized benzene molecules. Calculate the "local" concentration of benzene in the micelle 2. Assuming that at 298 K the CMC for a cerrain surfactant is 6 X 10-3 M and that its mean aggregation number is 70, estimate the concentration of micelles if the bulk sur factant concentration is 0.08 M. 3. A quantity (390 mg) of n-hexane is solubilized in 100 mL of the surfactant solution in question 2. Assuming that all the solubilized n-hexane molecules are in the micelles, what is the mean occupation number of 71-hexane in the micelles? 4. For the system in question 2, estimate tlGo for micellization if the molecular weight of the surfactant is 326 g mol-I . If the enthalpy of micellization is 8 kJ mol- I, find the en tropy change when 1 mol of micelles forms from 70;:mhnomers. I ONLY NEED THE SOLUTION FOR QUESTION 4. thank you!