In: Chemistry
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. |
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H3O+ |
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HCO3 |
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