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- In an experimental study of membrane-like assemblies of synthetic materials, a phase diagram like that shown was obtained. The two components are dielaidoylphosphatidylcholine (DEL) and dipalmitoylphosphatidylcholineIDPU. Explain what happens as a liquid mixture of composition xDel = 0.5 is cooled from 45 °C.The amino acid glycine (H2N—CH2—COOH) can participatein the following equilibria in water:H2N—CH2—COOH + H2O ⇌H2N—CH2—COO- + H3O+ Ka = 4.3 x 10-3 H2N—CH2—COOH + H2O ⇌+H3N—CH2—COOH + OH- Kb= 6.0 x 10-5(a) Use the values of Ka and Kb to estimate the equilibriumconstant for the intramolecular proton transfer to forma zwitterion:H2N—CH2—COOH ⇌ +H3N—CH2—COO-(b) What is the pH of a 0.050 M aqueous solution of glycine?(c) What would be the predominant form of glycine in asolution with pH 13? With pH 1?The Ksp of Cu3 (AsO4)2 at 25^0C is 7.6×10^-36. What is the molar solubility of Cu3 (AsO4)2 in water at 25^0C?
- Given the borax reaction: Na22B44O5(OH)4 × 8H2O(s) <=> 2Na+(aq) + B4O5(OH)42-(aq) + 8H2O(l) What would be the Ksp of borax at 40°C if the solubility of borax is 0.8 mol L-1 at that temperature?The solubility of acetylsalicylic acid in ethanol at room temperature is 80 mg/ml. What is the minimum volume of ethanol needed to dissolve the aspirin obtained from 4.5 g salicylic acid (LR) and acetic anhydride if the yield was 65%? Show your work.Estimate the osmotic pressure associated with 24.5 g of an enzyme of molecular weight 4.21 x 10-6 dissolved in 1740. mL of ethyl acetate solution at 38.0°C
- The molar mass of an enzyme was determined by dissolving it in water, and measuring the height, h, of the resulting solution drawn up a capillary tube at 20 °C. The following data were obtained.C/(mg cm-3) 3.221 4.618 5.112 6.722h/cm 5.746 8.238 9.119 11.990The osmotic pressure may be calculated from the height of the column, ∏= hpg, taking the mass density of the solution as p = 1.000 g cm-3 and the acceleration of free fall as g = 9.81 m s-2. Determine the molar mass of the enzyme.Would you expect ninhydrin reagent to react with a proline solution? Why or why not? The isoelectric point of casein is at pH 4.6. What charge would you expect the casein to carry in milk (pH 6.6)? What would be a good way to extract milkfat from your casein precipitate? (think: solvent polarity) What intermolecular forces would be disrupted by a change in pH?In the preparation of the standard curve for protein analysis, 50 mn BSA (bovine serum albumin) dissolved in H2O to a final volume of 5 mL was used as stock solution. What is the weight of BSA in 0.1 mL of stock solution? In 0.2 mL?
- The Ksp for BaF2 is 1.6x10^-6.What is tge concentration of Ba+2 ions in this solution?Erwin Smith wants to determine the average concentration of amino acids present in the spinal fluid of Eldians. He assigned four people to complete this task. Who among these four people will be able to obtain the best results? a.Levi Ackerman, who obtained samples from 100 Eldians from Wall Maria b.Mikasa Ackerman, who obtained samples from 100 Eldians from Wall Rose c.Hange Zoe, who obtained samples from 50 Eldians inside Wall Sina and 50 Eldians from Wall Rose d.Armin Arlert, who obtained samples from 34 Eldians from Wall Maria, 33 Eldians from Wall Rose, and 33 Eldians from Wall SinaWrite the differences between physisorption and chemisorption with respect to the following: (i) Specificity (ii) Temperature dependence (iii) Reversibility and (iv) Enthalpy change