Concept explainers
Which of the acids in Table 16.6 can be used to prepare a buffer of pH 6.5? (Select all that apply.)
(a)
hydrofluoric acid
(b)
benzoic acid
(c)
hydrocyanic acid
(d)
phenol
(e)
none
Interpretation:
The acidthat can be used to preparea buffersolution with apH value of
Concept introduction:
The
Here,
Answer to Problem 1KSP
Correct answer:Option (e).
Explanation of Solution
Reason for correct option:
The term
Therefore, the pH of the solution formed from the given acid is given by the expression as follows:
Forhydrochloric acid,
The acid ionization constant of hydrofluoric acid is
The value of
The pH of the buffer solution formed from hydrofluoric acid is calculated as follows:
Forbenzoic acid,
The acid ionization constant of benzoic acid is
The value of
The pH of the buffer solution formed from benzoic acid is calculated as follows:
For hydrocyanic acid,
The acid ionization constant of hydrocyanic acid is
The value of
The pH of the buffer solution formed from hydrocyanic acid is calculated as follows:
For phenol,
The acid ionization constant of phenol is
The value of
The pH of the buffer solution formed from phenol is calculated as follows:
Therefore, a buffer solution with apH value of
Hence, option (e) is correct.
Reason for incorrect option:
Option (a) is incorrect because, according to above explanation, a buffer solution with a pH value between
Option (b) is incorrect because, according to above explanation, a buffer solution with a pH value between
Option (c) is incorrect because, according to above explanation, a buffer solution with a pH value between
Option (d) is incorrect because, according to above explanation, a buffer solution with a pH value between
Hence, options (a), (b), (c), and (d) are incorrect.
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