MCQ
The $\left[ {HC{O_3}^ - } \right]/\left[ {{H_2}C{O_3}} \right]$ ratio in the buffer present in blood $(pH = 7.4)$ is approximately $(pK_a = 6.1$ for $H_2CO_3$)
- ✓$20$
- B$16$
- C$24$
- D$10$
✓
Answer
Correct option: A.
$20$
a
$\mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log \frac{\left[\mathrm{HCO}_{3}^{-}\right]}{\left[\mathrm{H}_{2} \mathrm{CO}_{3}\right]}$
$\mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log \frac{\left[\mathrm{HCO}_{3}^{-}\right]}{\left[\mathrm{H}_{2} \mathrm{CO}_{3}\right]}$
or $7.4=6.1+\log \frac{\left[\mathrm{HCO}_{3}^{-}\right]}{\left[\mathrm{H}_{2} \mathrm{CO}_{3}\right]}$
or $\frac{\left[\mathrm{HCO}_{3}^{-}\right]}{\left[\mathrm{H}_{2} \mathrm{CO}_{3}\right]}=20$
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