The following is list of weak acids and their pka values weak acid „pKa benzoic acid 4.20 hydrogen citrate 6.40 hydrocyanic acid 9.31 hydrogen phosphate 12.38 Which would be the best buffer to use at pH 7? For benzoic acid, a 50:50 mixture of benzoic acid and its conjugate base, the benzoate ion, would have pH = The buffering capacity of a benzoic acid:benzoate buffer would be at pH = 7 А. 4.20 В. 6.40 С. 9.31 E. benzoic acid F. hydrogen citrate D. 12.38 G. hydrocyanic acid H. hydrogen phosphate I. good J. bad

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The following is list of weak acids and their pką values
weak acid
pKa
benzoic acid
4.20
hydrogen citrate
6.40
hydrocyanic acid
9.31
hydrogen phosphate
12.38
Which would be the best buffer to use at pH 7 ?
For benzoic acid, a 50:50 mixture of benzoic acid and its conjugate base, the benzoate ion, would have pH =
The buffering capacity of a benzoic acid:benzoate buffer would be
at pH = 7
A. 4.20
B. 6.40
C. 9.31
D. 12.38
E. benzoic acid
F. hydrogen citrate
G. hydrocyanic acid
H. hydrogen phosphate
I. good
J. bad
Transcribed Image Text:The following is list of weak acids and their pką values weak acid pKa benzoic acid 4.20 hydrogen citrate 6.40 hydrocyanic acid 9.31 hydrogen phosphate 12.38 Which would be the best buffer to use at pH 7 ? For benzoic acid, a 50:50 mixture of benzoic acid and its conjugate base, the benzoate ion, would have pH = The buffering capacity of a benzoic acid:benzoate buffer would be at pH = 7 A. 4.20 B. 6.40 C. 9.31 D. 12.38 E. benzoic acid F. hydrogen citrate G. hydrocyanic acid H. hydrogen phosphate I. good J. bad
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