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Carbonic acid, H2CO3, is a weak diprotic acid. In a 0.1 M solution of the acid,...

Carbonic acid, H2CO3, is a weak diprotic acid. In a 0.1 M solution of the acid, which of the following species is present in the largest amount?

H2CO3.

H3O+

HCO3

Solutions

Expert Solution

H2CO3, is a weak diprotic acid.

The dissociation of carbonic acid is ( by loosing one proton )

                                  H2CO3 + H2O    HCO3- + H3O+

This first dissociation occurs more fast.

The dissociation of HCO3- is

                                 HCO3- + H2O CO32- + H3O+

This second dissociation is done slowly.

Since the first dissociation of carbonic acid is more so the formed HCO3- is more.Since water place an important to occur dissociation the formed So the formed H3O+ concentration will also more.

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We know that ?T f = iKf x m
Where

?T f = depression in freezing point = ?

K f = depression in freezing constant of water = 1.858


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