The pKa1 value for carbonic acid is 6.35. The variatio of carbonic acid, bicarbonate and carbonate with pH is as given below.
When pH<<<pKa1, then [H2CO3] approximately equal to1.
When pH=pKa1, then H2CO3 and HCO3- co exist.
When 7<pH<10, HCO3- is present.
When pH>10 CO3- is present.
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