What is the pH of a buffer made from 0.580 mol of CH3NH2 (Kb = 4.4x 10-4) and 0.260 mol of CH3NH31?

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Answered: What is the pH of a buffer

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter15: Complex Acid/base Systems

Section: Chapter Questions

Problem 15.21QAP

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4. To prepare a buffer containing CH3CO2H and NaCH3CO2 and having a pH of 5, the ratio of the concentration of CH3CO2H to that of NaCH3CO2 should be about 1/1 1.8/1 1/1.8 5.0/1
A buffer is made using 45.0 mL of 0.750 M HC3H5O2 (Ka = 1.3 105) and 55.0 mL of 0.700 M NaC3H5O2. What volume of 0.10 M NaOH must be added to change the pH of the original buffer solution by 2.5%?
K4 for acetic acid is 1.7 105 at 25C. A buffer solution is made by mixing 52.1 mL of 0.122 M acetic acid with 46.1 mL of 0.182 M sodium acetate. Calculate the pH of this solution at 25C after the addition of 5.82 mL of 0.125 M NaOH.
Which of these buffers involving a weak acid HA has the greater resistance to change in pH? Explain your answer. (i) [HA] =0.100 M = [A] (ii) [HA] = 0.300 M = [A]
Malonic acid (HO2CCH2CO2H) is a diprotic acid. In the titration of malonic acid w ith NaOH, stoichiometric points occur at pH = 3.9 and 8.8. A 25.00-mL sample of malonic acid of unknown concentration is titrated with 0.0984 M NaOH, requiring 31.50 mL of the NaOH solution to reach the phenolphthalein end point. Calculate the concentration of the initial malonic acid solution. (Sec Exercise 113.)
Sketch two pH curves, one for the titration of a weak acid with a strong base and one for a strong acid with a strong base. How are they similar? How are they different? Account for the similarities and the differences.
Fifty cm3 of 1.000 M nitrous acid is titrated with 0.850 M NaOH. What is the pH of the solution (a) before any NaOH is added? (b) at half-neutralization? (c) at the equivalence point? (d) when 0.10 mL less than the volume of NaOH to reach the equivalence point is added? (e) when 0.10 mL more than the volume of NaOH to reach the equivalence point is added? (f) Use your data to construct a plot similar to that shown in Figure 14.10 (pH versus volume NaOH added).
Calculate the pH at the following points in a titration of 40 mL (0.040 L) of 0.100 M barbituric acid (Ka=9.8105) with 0.100 M KOH. (a) no KOH added. (b) 20 mL of KOH solution added. (c) 39 mL of KOH solution added. (d) 40 mL of KOH solution added. (e) 41 mL of KOH solution added
What is the pH of a buffer that is 0.12 M in lactic acid [CH3CH(OH)COOH, or HC3H5O3] and 0.10 M in sodium lactate[CH3CH(OH)COONa or NaC3H5O3]? For lactic acid, Ka = 1.4 x 10-4.
What is the pH of the buffer solution that contains 2.2 g of NH4Cl in 250 mL of a 0.070 M NH3? Is the final pH lower or higher than the pH of the 0.070 M solution? (Kb for amonia is 1.8×10^-5)
The pKa of acetic acid, C2H3O2 is 4.75. What is the pH of a buffer in which [HC2H3O2] = 0.20 M and [NaC2H3O2] = 2.0 M?
Calculate the p H of a buffer containing 0.50 mol/L of pyruvic acid CH3COCOOH, and 060 mol sodium pyruvate , Na+CH3COCOO-. Ka of pyruvic acid = 3.2 x 10-3

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