A buffered solution containing dissolved aniline, CH,NH2, and aniline hydrochloride, CH, NH, Cl, has a pH of 5.41.Determine the concentration of CH, NH in the solution if the concentration of CH, NH, is 0.305 M. The pK of aniline is9.13.[CHẠNH]=Calculate the change in pH of the solution, ApH, if 0.375 g NaOH is added to the buffer for a final volume of 1.40 L. Assumethat any contribution of NaOH to the volume is negligible.ApH =M

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Answered: A buffered solution containing…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter15: Additional Aqueous Equilibria

Section: Chapter Questions

Problem 124QRT

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Ka for formic acid is 1.7 104 at 25C. A buffer is made by mixing 529 mL of 0.465 M formic acid, HCHO2, and 494 mL of 0.524 M sodium formate, NaCHO2. Calculate the pH of this solution at 25C after 110 mL of 0.152 M HCl has been added to this buffer.
A 0.288-g sample of an unknown monoprotic organic acid is dissolved in water and titrated with a 0.115 M sodium hydroxide solution. After the addition of 17.54 mL of base a pH of 4.92 is recorded. The equivalence point is reached when a total of 33.83 mL of NaOH is added. a What is the molar mass of the organic acid? b What is the Ka value for the acid? The Ka value could have been determined very easily if a pH measurement had been made after the addition of 16.92 mL of NaOH. Why?
A student intends to titrate a solution of a weak monoprotic acid with a sodium hydroxide solution but reverses the two solutions and places the weak acid solution in the buret. After 23.75 mL of the weak acid solution has been added to 50.0 mL of the 0.100 M NaOH solution, the pH of the resulting solution is 10.50. Calculate the original concentration of the solution of weak acid.
Enough water is added to the buffer in Question 29 to make the total volume 10.0 L. Calculate (a) the pH of the buffer. (b) the pH of the buffer after the addition of 0.0500 mol of HCl to 0.600 L of diluted buffer. (c) the pH of the buffer after the addition of 0.0500 mol of NaOH to 0.600 L of diluted buffer. (d) Compare your answers to Question 29(a)-(c) with your answers to (a)-(c) in this problem. (e) Comment on the effect of dilution on the pH of a buffer and on its buffer capacity.
A buffered solution containing dissolved aniline, CH,NH,, and aniline hydrochloride, CH, NH, Cl, has a pH of 5.27. Determine the concentration of CH, NH in the solution if the concentration of CH, NH, is 0.275 M. The pK, of aniline is $ 9.13. [CH_NH] = = Calculate the change in pH of the solution, ApH, if 0.386 g NaOH is added to the buffer for a final volume of 1.35 L. Assume that any contribution of NaOH to the volume is negligible. ApH = M
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