Carbonic acid C2CO3, is a diprotic acid with pk's 6.35 and 10.33. which of the following...
Carbonic acid C2CO3, is a diprotic acid with pk's 6.35 and 10.33. which of the following PH's would be in the buffering range for carboxylate buffers?
-pH3
-pH5
-pH 7
-pH 12
-pH 4
-pH 11
Homework Answers
Answer: pH5 & pH7 only.
The optimal buffering capacity will be at pH = pKa ± 1, since buffering capacity can be defined as it is the maximum amount of acid (or base) the buffer solution can resist before it starts showing a significant/drastic change in pH.
pH = pKa1 ± 1 = 6.35 ± 1 ====> means the range 5.35 - 7.35 ( This seems to be ok)
pH = pKa2 ± 1 = 10.33 ± 1 ====> means the range 9.33 - 11.33 (This looks like highly basic so we will omit)
Answer: pH5 & pH7 only.
Please have a look at the following figure to better understand how this will works
Hope this helped you!
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