Q 1(h)Which buffer system will have the greatest buffer capacity at pH 5.5?Acetic acid/sodium acetate (Ka = 1.75 x 105)I.II.Benzoic acid/sodium benzoate (Ka = 6.28 x 10-5)III. Hydrogen fluoride/potassium fluoride (Ka = 6.8 x 104)IV. Pyridine/pyridinium chloride (Ka = 6.3 x 10-6)Q 1(i)Calculate the relative concentrations of hypochlorous acid (Ka = 3.0 x 108) andchlorite ion in a solution with 0.05 M total hypochlorous acid (pH = 7.5).Q 1(j)What is the pH of a 0.04 M solution of arsenic acid?Ka1 = 5.8 x 10-3Ka2 = 1.10 x 10-7Ka3 = 3.2 x 10-12Page 2 of 7

h) Buffer capacity is more when it's pKa is nearer to its pH. pH = -log(H+) and pKa= - log (Ka)…

Q 1(h) Which buffer system will have the greatest buffer capacity at pH 5.5? Acetic acid/sodium acetate (K₂ = 1.75 x 105) Benzoic acid/sodium benzoate (K₂ = 6.28 x 105) I. II. III. Hydrogen fluoride/potassium fluoride (Ka = 6.8 x 104) IV. Pyridine/pyridinium chloride (Ka = 6.3 x 106)

Q 1(h) Which buffer system will have the greatest buffer capacity at pH 5.5? Acetic acid/sodium acetate (K₂ = 1.75 x 105) Benzoic acid/sodium benzoate (K₂ = 6.28 x 105) I. II. III. Hydrogen fluoride/potassium fluoride (Ka = 6.8 x 104) IV. Pyridine/pyridinium chloride (Ka = 6.3 x 106)

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. Ionic equilibrium is established between the ions and unionized species in a system. Understanding the concept of ionic equilibrium is very important to answer the questions related to certain chemical reactions in chemistry.

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Bronsted-Lowry base in inorganic chemistry is any chemical substance that can accept a proton from the other chemical substance it is reacting with.

Question

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Q 1(h)
Which buffer system will have the greatest buffer capacity at pH 5.5?
Acetic acid/sodium acetate (Ka = 1.75 x 105)
I.
II.
Benzoic acid/sodium benzoate (Ka = 6.28 x 10-5)
III. Hydrogen fluoride/potassium fluoride (Ka = 6.8 x 104)
IV. Pyridine/pyridinium chloride (Ka = 6.3 x 10-6)
Q 1(i)
Calculate the relative concentrations of hypochlorous acid (Ka = 3.0 x 108) and
chlorite ion in a solution with 0.05 M total hypochlorous acid (pH = 7.5).
Q 1(j)
What is the pH of a 0.04 M solution of arsenic acid?
Ka1 = 5.8 x 10-3
Ka2 = 1.10 x 10-7
Ka3 = 3.2 x 10-12
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