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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Kaustubh Nagrale posted an Question
February 19, 2021 • 21:23 pm
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30 points
30 points
- CSIR NET
- Life Sciences
The apparent ph of a fluid is 7.45 , where bicarbonate buffer is involved for maintaining its ph. values of pka of carbonic acid are 6.15 and 10.45. the molar r
The apparent pH of a fluid is 7.45 , where bicarbonate buffer is involved for maintaining its pH. values of pka of carbonic acid are 6.15 and 10.45. The molar ratio of conjugate base:acid is please give detailed answer
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Eduncle
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Hello ,
Greeting !!
Here is the answer of your doubt,
pH= pKa + log [conjugate base/acid]
7.45= 6.15 + log [conjugate base/acid]
log [conjugate base/acid] = 1.3
Take the antilog on both sides:
[conjugate base/acid] = 20/1
Thank you for asking.
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Kaustubh nagrale
why pka used 6.15 instead of 10.45
Buffer capacity means the ability of substance to maintain the pH of solution. Closer the pH and pKa value, higher will be it's buffer capacity.
While selecting a buffer solution, buffer solution with a pKa value close to target pH is selected to maximize the buffer capacity.
That's why we used 6.15 in that question instead of 10.45 as 6.15 is closer to 7.45