A) The concentration of\[{{H}^{+}}\]is double that of\[CO_{3}^{2-}\]
B) The concentration of\[{{H}^{+}}\]is 0.034 M.
C) The concentration of\[CO_{3}^{2-}\]is greater than that of\[HCO_{3}^{-}\]
D) The concentration of\[{{H}^{+}}\]and\[HCO_{3}^{-}\]are approximately equal.
Correct Answer: D
Solution :
\[{{H}_{2}}C{{O}_{3}}{{H}^{+}}+HCO_{3}^{-}\] \[{{k}_{1}}=4.2\times {{10}^{-7}}\] \[0.034\,M\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,x\] \[HCO_{3}^{-}{{H}^{+}}+CO_{3}^{-2}\] \[{{k}_{1}}=4.8\times {{10}^{-11}}\] \[x-y\,\,\,\,\,\,\,\,\,\,\,\,x+5\] As\[{{k}_{2}}<<{{k}_{1}},\] disso in second is negligible \[\therefore \] \[x\text{ }+\text{ }y\cong x\] and hence \[({{H}^{+}})\cong [HCO_{3}^{-}]\]
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