H2CO3 has a conjugate base which has some resonating structures, HCO3- on the other hand has a conjugate base which has 3 identical resonating structures and the O atoms share the -ve charge making it more stable than the former. Then why is h2co3 more acidic.
it's simple h2co3 is more acidic because in HCO3- the hydrogen left is attached to carbon therefore it cannot leave by leaving the negative charge on the carbon thereby forming very unstable conjugate base but in H2CO3 one hydrogen is attached with oxygen which can easily and forming a resonnce stabilized conjugate base.
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