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Why carbonic acid is a weak acid?

 Weak acids are those which doesn’t completely dissociate in solution.

H2CO3 = H(+) + HCO3(-)

There always exist an equilibrium (here = sign) between LHS and RHS. So some of H(+) always combines with HCO3(-) to give the backward reaction. That’s why amount of free H(+) in the solution decreases.


That’s it.

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