The weak base carbonate reacts with the water forming bicarbonate and the hydroxide ion.
The weak bases are given as the compounds that have the inability to get completely dissociated in water.
The carbonate is given as the weak base, as in water it remains constituted in the form of a bond with oxygen.
The reaction of water with the carbonate ion is given as:
[tex]\rm CO_3^{2-}\;+\;H_2O\;\rightleftharpoons HCO_3^-\;+\;OH^-[/tex]
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