Answers: 1
and 
. It acts as a buffer as it is a combination of the weak acid 
and it's conjugate base 
.![[Acid] = [HCO_{3}^{-}]=1.0 M](/tpl/images/0034/7560/4bf34.png)
![[Base] =[CO_{3}^{2-}]=0.1 M](/tpl/images/0034/7560/6fbc0.png)
![pH=pK_{a}+log\frac{[CO_{3}^{2-}]}{[HCO_{3}^{-}]}](/tpl/images/0034/7560/044bf.png)
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