Calculate the pH of a solution of proline in which the concentrationof the isoelectric structure is 6 times smaller than that of the species with a net charge of -1. (Hint: use the Henderson-Hasselbach equation and see examples from written info on slides.)
Calculate the pH of a solution of proline in which the concentrationof the isoelectric structure is...
1. Calculate the charge on the side chain of the amino acid histidine using the Henderson-Hasselbach equation pH = pKa + log (A/HA+). Use pH =7 and a pKa = 6 and solve to 2 significant figures. 2. Cysteine proteases have unusually reactive cysteine side chains. For one of these enzymes in solution at pH 7 you are able to measure the amount of the deprotonated sulfhydryl (ie, the negatively charged species) as 40% of the total. Calculate the pKa...
Gel electrophoresis. Polypeptides can be separated by electrophoresis according to their relative content of acidic and basic residues. The isoelectric point (pI) of a polypeptide is the pH at which its net charge is zero. (See Fig 3.11 of your textbook). A) At physiological pH (= 7.4), what is the net charge on the tripeptide Asp-Arg-Glu-His? B) Calculate the pI of this tetrapeptide. [Hint: Using the pK, values in Table 2.1 and the Henderson-Hasselbalch equation, determine the pH when the...
A 25.0 mL of a weak acid is titrated with a strong base (0.1 M). Calculate the pH of the solution during the titration if the weak acid concentration is 0.10 M and its Ka = 1.8 x 10-5 and 10.0 mL of base has been added. (Hint: use Henderson-Hasselbach equation). Question options: a) pH= 7.00 b) pH= 5.28 c) pH = 4.56 d) pH= 4.74
1. Calculate the pH of a buffer solution which is 0.50M in NH3 and 0.30M in NH4Cl. Given Kb = 1.8 x 10^-5 for NH3. a) Calculate Ka. b) Calculate pKa. c) Calculate pH using the Henderson-Hasselbalch equation.
* 2. Calculate the pH of a buffer solution that is 0.050 M in benzoic acid (HC,H,O,) and 0.150 M in sodium benzoate (NaC,H,O,). For benzoic acid, K = 6.5 X10. Use the Henderson-Hasselbalch approach. (6 points) Equation: HC,H,02(aq) + H20(1) = H,0*(aq) + C,H,O, (aq) Hint: pH = pKa + log base] (acid]
Calculate pH of a weak acid/conjugate base buffer solution. 1. a) Calculate the pH of 650. mL of a 0.211-M solution of acetic acid before and after the addition of 0.123 mol of potassium acetate. pH befor addition = pH after addition = 1 b) Calculate pH of a weak base/conjugate acid buffer solution. A 0.190-M aqueous solution of C2H5NH2 (ethylamine) has a pH of 11.9. Calculate the pH of a buffer solution that is 0.190 M in C2H5NH2 and...
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: A solution that is 0.14 M in NH3 and 0.20 M in NH4Cl. (Kb= 1.76x10^-5)
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: A. a solution that is 0.14 M in HCHO2 and 0.13 M in NaCHO2 B. a solution that is 0.15 M in NH3 and 0.18 M in NH4Cl
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: A. a solution that is 0.14 M in HCHO2 and 0.13 M in NaCHO2 B. a solution that is 0.15 MM in NH3NH3 and 0.18 MM in NH4Cl
5. (2pts) To calculate the pH of buffer solution we need to use Henderson-Hasselbalch equation The generic form of this equation is: 6. (8 points) What is the pH of a solution that contains 25 ml of 0.10 M HF and 25 ml 0.1M NaOH solution? (Ka of HF -6.8 x 104).