Sketch a plot of the fraction of species, f, vs pH for Tyr. Show your calculations for several points on the plot. You want to calculate the fraction of the species for more than 3 of the points. pKa’s for Tyr is 2.24, 9.04, and 10.10.
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Sketch a plot of the fraction of species, f, vs pH for Tyr. Show your calculations for several
points on the plot. You want to calculate the fraction of the species for more than 3 of the
points. pKa’s for Tyr is 2.24, 9.04, and 10.10.
Answer -
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- Deduce expressions for the fractions of each type of species present in an aqueous solution of lysine as a function of pH and plot the appropriate speciation diagram. Use the following values of the acidity constants: pKa (H3Lys2+) = 2.18. pKa (H2Lys+) = 8.95, pKa(Hlys) = 10.53.The pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Why are the acidities of the conjugate acids of these structures different by about two and a half orders of magnitude?Determine the pH and concentration of all species at equilibrium for the basic 5-fluorouracil species (C4HFN2O22-). Justify the use of approximations if necessary.Provide the equation for the mass balance of this solution. C4HFN2O22-= 0.30 M
- What are the concentrations of the various ionic species in a 0.1M solution of lysine at pH 4, 7, and 10?Using the following data: A (Chloroacetic acid) ClCH2COOH system, pKa = 2.472, Ca = 0.025M. Construct the plot of the master variable (Log C versus pH).The pKb of the organic base nicotine (denoted Nic) is 5.98. Write the corresponding protonation reaction, the deprotonation reaction of the conjugate acid, and the value of pKa for nicotine.
- The solution of total volume 0.50 L was prepared by the addition of 0.10 moles of KF to sifficient water. What are the major species of the solution and pH ?The pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Which nitrogen is the more basic in these structures and why?Calculate the degree of dissociation (a) of acetic acid if its molar conductivity (Λm) is 39.05 S cm2 mol-1.Given: λ°(H+) = 349.6 S cm2 mol-1 and λ°(CH3COO–) = 40.9 S cm2 mol-1
- The dissociation vapor pressure of a salt A2B(s) ⇌ A2(g) + B(g) at 367°C is 208 kPa but at 477°C it has risen to 547 kPa. For the dissociation reaction of A2B(s), calculate (i) the equilibrium constant, (ii) the standard reaction Gibbs energy, (iii) the standard enthalpy, and (iv) the standard entropy of dissociation, all at 422°C. Assume that the vapor behaves as a perfect gas and that ΔrH° and ΔrS° are independent of temperature in the range given.1) For an open system with PCO2=10−3.5 atm what fraction of the total carbonate is in the form of CO32− at pH 10.63? 2) Using paleolimnological methods it is possible to estimate past pH values of surface waters. If the estimate of pH is 5.787 , what is the corresponding PCO2? in atm.Calculate the fraction of intact H2PO3 molecules in an aqueous solution of phosphorous acid at (a) pH = 5.0 and (b) pH =9.0.
