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Question

The pH of blood is 7.4. If the buffer in bloods is CO2 and HCO3, calculate the ratio of conjugate base to acid (H2CO3) to maintain the pH of the blood. Given K1 of H2CO3=4.5×107



Your Answer
A

8.5

Your Answer
B

10.0

Correct Answer
C

11.25

Your Answer
D

None of these


Solution

The correct option is B

11.25


CO2+H2OHCO3+H+;K1=[HCO3][H+][CO2]=4.5×107or,[HCO3][CO2]=4.5×107[H+]=4.5×1074×108=11.25

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