Question

What is the pH of 0.10 M NaHCO3? Ka1 of H2CO3: 4.3E-7 Ka2 of H2CO3: 5.6E-11

What is the pH of 0.10 M NaHCO3?

Ka1 of H2CO3: 4.3E-7

Ka2 of H2CO3: 5.6E-11

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Answer #1

NaHCO3 is poly-protic acid. It is formed by the salt of a strong base and a weak acid.The pH of such acids cannot be calculated directly. Rather, their dissociation constants at each step has to be taken into consideration.

We have been provided with the concentration of NaHCO3 = 0.10 M

Ka1 = 4.3E-7 and Ka2 = 5.6E-11

The below images show the detailed calculation of pH

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