Chemical and Ionic Equilibrium - Result Question 71
####15. The species present in solution when $CO _2$ is dissolved in water are
(2006 Main)
(a) $CO _2, H _2 CO _3, HCO _3^{-}, CO _3^{2-}$
(b) $H _2 CO _3, CO _3^{2-}$
(c) $HCO _3^{-}, CO _3^{2-}$
(d) $CO _2, H _2 CO _3$
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Solution:
- When $CO _2$ is dissolved in water, following equilibria are established:
$$ \begin{aligned} H _2 O+CO _2 & \rightleftharpoons H _2 CO _3 \ H _2 CO _3 & \rightleftharpoons H^{+}+HCO _3^{-} \ HCO _3^{-} & \rightleftharpoons H^{+}+CO _3^{2-} \end{aligned} $$
Therefore, in solution, all of the above mentioned species exist.
