24-3. (a) What are the advantages and disadvantages of using a nar- rower open tubular column? (b) What are the advantages and disadvantages of using a longer open tubular column? (c) What are the advantages and disadvantages of using a thicker film of stationary phase?
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- Stripping #1 Ammonia is stripped from a dilute aqueous solution by countercurrent contact with air in a column containing seven sieve trays. The equilibrium relationship is ye = 0.80 xe, and when the molar flow of air is 1.5 times that of the solution, 90% of the ammonia is removed. %3D (a) How many ideal stages does the column have and what is the stage efficiency? (b) Under what thermodynamic conditions (temperature, pressure) is the column operating? [Discuss](7) Arrange the following column with increasing order of efficiency based on the plate height values: Plate height values (a) 0.5 mm; (b) 0.05mm; (c) 5 cm; (d) 5 mmI want Q3 (a) and (b) and (c)
- 10.) A 0.6025 g sample was dissolved and the Ca 2+ and Ba 2+ ions present were precipitated as BaC₂O4.H₂O and CaC₂O4.H₂O. The oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed 0.5713 g in the range 320 °C to 400°C and 0.4674 g in the range 580°C to 620°C. Calculate the percentage Ba in the sample. a.) What are the approximate values of Vm and Ve for this column? b.) What is the Kd for the unknown protein? c.) What is the approximate molar mass of the unknown protein?Consider a soil with negligible ionic strength (activity = concentration), constant pH of 7.7, (Ca2+) = 10*3.2 M and total P = 104.4 M Given the dissolution reaction of brushite is written: CaHPO4-2H2O(s) + H* (aq) 2 Ca2 "(aq) + H2PO4¯ (aq) + 2H2O .and that H3PO4 has a pka2 of 7.21, calculate log(IAP) (same as log(Q)) of the reaction, and save your answer for the next question. Your Answer:(a) What is the molarity of the NaOH? (b) Based on the propagation-of-error formula, what is the standard devlation of the molarity?
- Calibration of a glass electrode gave a reading of 134.9 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -69.1 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454), both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed slope theoretical What is the theoretical slope at 30 °C? pH -58.1 5.29 Incorrect What is the pH of an unknown that gives a reading of 41.4 mV with this electrode at 30 °C? Incorrect Incorrect mV/pH mV/pHRequired: Normality of IodinePenicillin F is recovered from a dilute aqueous fermentation broth by extraction with amyl acetate, using 6.5 volumes of solvent per 100. volumes of the aqueous phase. At pH = 3.8 the distribution coefficient KD is 74. (a) What fraction of the penicillin would be recovered in a single ideal stage? (b) What would be the recovery with three-stage extraction using fresh solvent in both stages? (c) How many ideal stages would be needed to give the same recovery as in part (b) if a counterflow cascade were used with V/L = 0.065?
- AE2 D/A2 D*/A, (b) 'Chemical doping' LUMO AE0 ΔΕ. ex HOMO 1L 11 НОМО D/A1 D'/A (a) 'Photo doping' Describe in brief about chemical doping and photo doping with respect to the above images?A 0.0200 gram blood sample was decomposed by a microwave digestion technique followed by dilution to 100.0 mL in a volumetric flask. Aliquots of the sample solution were treated with a lead complexing reagent and water as follows: Solution 1: 10.0 ml blood sample + 20.0 mL complexing agent + 30.0 mL H20. Solution 2: 10.0 ml blood sample + 20.0 mL complexing agent + 26.0 mL H20 + 4.00 mL of 78 ppb Pb2+ standard. The resulting solutions were analyzed by UV/Vis at 375 nm. Absorbance for solution 1 = 0.155 and for solution 2 = 0.216. Calculate the concentration of lead (ppb) in the original sample.[3] The following Figure is the electrocapillary curves (A) and differential capacitance curves (B) for mercury in contact with 0.5 M Na,SO4 in the presence and absence of n-heptanol . 440- (A) (B) 420 Na,So. 400 Na, So, CHOH 360 Na so, 20 340- Na So, CH,OH 10 320 0.4 0.8 12 1.6 20 24 0.4 0.8 1.2 -EV ex NCE) 1.6 2.0 -EV e NCE (a) How do the curves in figure (A) relate to those in figure (B)? (b) What implications can be derived from the flat region in the electrocapillary curves in the presence of n-heptyl alcohol? (c) If we measure the electrocapillary curve of mercury in contact with 0.5 M Na,SO4 at higher temperature, what changes in the curve can be observed? Try to give explanation of these changes.