Determine the pH of a Tris/TrisH* buffer solution by constructing an ICE table, writing the equilibrium constant expression, and using this information to determine the pH. The pKa for TrisH* is 8.30. Complete Parts 1-3 before submitting your answer. 1 Tris buffers are solutions of tris (hydroxymethyl)aminomethane, a weak base of formula C₂H₁NO3, combined with its protonated form, TrisH+, HC4H₁₁NO3*. A buffer solution is prepared by mixing 50.00 mL of 0.250 M Tris solution with 50.00 mL of 0.200 M TrisH solution. Fill in the ICE table with the appropriate value for each involved species to determine concentrations of all reactants and products. Initial (M) Change (M) Equilibrium (M) 0 2 HC4HNO3+ H₂O(1) H₂O*(aq) C4H₁NO3(ac 0.0125 +X 0.250 0.0125 - x 0.0125 + x 0.0100 - x 0.0100 + x 0.0100 - 2x Tap here or pull up for additional resources 0.0100 3 0.0125 - 2x RESET 0.200 -X 0.0125 + 2x 0.0100 + 2x

Determine the pH of a Tris/TrisH* buffer solution by constructing an ICE table, writing the equilibrium constant expression, and using this information to determine the pH. The pKa for TrisH* is 8.30. Complete Parts 1-3 before submitting your answer. 1 Tris buffers are solutions of tris (hydroxymethyl)aminomethane, a weak base of formula C₂H₁NO3, combined with its protonated form, TrisH+, HC4H₁₁NO3. A buffer solution is prepared by mixing 50.00 mL of 0.250 M Tris solution with 50.00 mL of 0.200 M TrisH solution. Fill in the ICE table with the appropriate value for each involved species to determine concentrations of all reactants and products. Initial (M) Change (M) Equilibrium (M) 0 2 HC4HNO3+ H₂O(1) H₂O(aq) C4H₁NO3(ac 0.0125 +X 0.250 0.0125 - x 0.0125 + x 0.0100 - x 0.0100 + x 0.0100 - 2x Tap here or pull up for additional resources 0.0100 3 0.0125 - 2x RESET 0.200 -X 0.0125 + 2x 0.0100 + 2x

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter15: Acid-base Equilibria

Section: Chapter Questions

Problem 8RQ: Sketch the titration curve for a weak base titrated by a strong acid. Weak basestrong acid titration...

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8-55 We commonly refer to a buffer as consisting of approximately equal molar amounts of a weak acid and its conjugate base—for example, CH3COOH and CH3COO-. Is it also possible to have a buffer consisting of approximately equal molar amounts of a weak base and its conjugate acid? Explain.
Sketch a titration curve for the titration of potassium hydroxide with HCl, both 0.100 M. Identify three regions in which a particular chemical species or system dominates the acid-base equilibria.
Ammonia gas is bubbled into 275 mL of water to make an aqueous solution of ammonia. To prepare a buffer with a pH of 9.56, 15.0 g of NH4Cl are added. How many liters of NH3; at 25C and 0.981 atm should be used to prepare the buffer? Assume no volume changes and ignore the vapor pressure of water.
The species called glacial acetic acid is 98% acetic acid by mass (d=1.0542g/mL). What volume of glacial acetic acid must be added to 100.0 mL of 1.25 M NaOH to give a buffer with a pH of 4.20?
What mass of NH4Cl must be added to 0.750 L of a 0.100-M solution of NH3 to give a buffer solution with a pH of 9.26? (Him: Assume a negligible change in volume as the solid is added.)
What is an acidbase indicator? Define the equivalence (stoichiometric) point and the end point of a titration. Why should you choose an indicator so that the two points coincide? Do the pH values of the two points have to be within 0.01 pH unit of each other? Explain.
Sketch the titration curve for a weak base titrated by a strong acid. Weak basestrong acid titration problems also follow a two-step procedure. What reaction takes place in the stoichiometry part of the problem? What is assumed about this reaction? At the various points in your titration curve, list the major species present after the strong acid (HNO3, for example) reacts to completion with the weak base, B. What equilibrium problem would you solve at the various points in your titration curve to calculate the pH? Why is pH 7.0 at the equivalence point of a weak basestrong acid titration? If pH = 6.0 at the halfway point to equivalence, what is the Kb value for the weak base titrated? Compare and contrast the titration curves for a strong basestrong acid titration and a weak basestrong acid titration.
When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence point is reached when 35.00 mL base has been added. After 20.00 mL NaOH solution has been added, the titration mixture has a pH of 5.75. Calculate the ionization constant of the acid.
. How is the strength of an acid related to the fact that a competition for protons exists in aqueous solution between water molecules and the anion of the acid?
Amino acids are an important group of compounds. At low pH, both the carboxylic acid group (CO2H) and the amine group (NHR) are protonated. However, as the pH of the solution increases (say, by adding base), the carboxylic acid proton is removed, usually at a pH between 2 and 3. In a middle range of pHs, therefore, the amine group is protonated, but the carboxylic acid group has lost the proton. (This is called a zwitterion.) At more basic pH values, the amine proton is dissociated. What is the pH of a 0.20 M solution of alanine hydrochloride, [NH3CHCH3CO2H]Cl?
The common ion effect for weak acids is to significantly decrease the dissociation of the acid in water. Explain the common ion effect.
Marble is almost pure CaCO3. Acid rain has a devastating effect on marble statuary left outdoors. Assume that the reaction which occurs is CoCO3(s)+ H+(aq)Ca2+(aq)+HCO3(aq) Neglecting all other competing equilibria and using Tables 15.1 and 13.2, calculate (a) K for the reaction. (b) the molar solubility of CaCO3 in pure water. (c) the molar solubility of CaCO3 in acid rainwater with a pH of 4.00.