Question

What % of carbon in h2co3 -hco3- buffer should be in the form of hco3-?

Answer 1

Answer:

80%

Explanation:

Using Henderson Hasselbalch Equation for buffer, pH=pKa​+logHAA−​

pH=pKa​+log[H2​CO3​][HCO3−​]​ --(1)

pKa​=−log(Ka​)=−log(4×10−7)=−log4+7

pH = 7 (Neutral solution)

Substitute in 1:

7=−log4+7+log[H2​CO3​][HCO3−​]​

log[H2​CO3​][HCO3−​]​=log4

[H2​CO3​][HCO3−​]​=14​

Thus, percentage of buffer in the form HCO3−​=54​×100=80 %

Link:

https://www.toppr.com/ask/question/what-of-the-carbon-in-the-h2co3hco3-buffer-should-be-in-the-form-of/

Answer 2

Answer:

pH=pKa+logH2CO3HCO3−

7=7−log+logH2CO3HCO3−(H2CO3)HCO3−=4

%HCO3−=54×100⇒80%