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A buffer solution is 0.310 M in H2CO3 and 0.291 M in KHCO3. If Ka1 for...

A buffer solution is 0.310 M in H2CO3 and 0.291 M in KHCO3. If Ka1 for H2CO3 is 4.2x10^-7 , what is the pH of this buffer solution?

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Answer #1

PKa     = -logKa

            = -log4.2*10^-7

            = 6.3767

[H2CO3]   = 0.310M

[KHCO3]   = 0.291M

PH    = PKa + log[KHCO3]/[H2CO3]

         = 6.3767 + log0.291/0.310

         = 6.3767 -0.02747   = 6.35 >>>>answer

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