Calculate the \( \mathrm{pH} \) of \( 0.1 \mathrm{M} \mathrm{NaHCO}...

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Calculate the \( \mathrm{pH} \) of \( 0.1 \mathrm{M} \mathrm{NaHCO} \) solution if dissociation constants for \( \mathrm{H}_{2} \mathrm{CO}_{3} \) are \( \mathrm{Ka}_{1} \) and \( \mathrm{Ka}_{2} \) respectively :
A. \( \mathrm{pH}=\mathrm{pKa}_{1}+\mathrm{pKa}_{2} \)
B. \( \mathrm{pH}=\mathrm{pKa}_{1}-\mathrm{pKa}_{2} \)
C. \( \mathrm{pH}=0.5\left[\mathrm{pKa}_{1}+\mathrm{pKa}_{2}\right] \)
D. \( \mathrm{pH}=2\left[\mathrm{pKa}_{1}+\mathrm{pKa}_{2}\right] \)
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