In a buffer solution, if [Aƒ{] pKa d. pH 7.00

In a buffer solution, if [Aƒ{] < [HA], which of the following must be true?

a. pH < pKa
b. pH = pKa
c. pH > pKa
d. pH < 7.00
e. pH > 7.00

3 answers

Here is the Henderson-Hasselbalch equation.
pH = pKa + log [(base)/(acid)].
base is A
acid is HA
If base < acid, the fraction must be less than 1, the log of a number less than 1 is negative; therefore, pH must be .....than pKa.

less than

greater than

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