What is the pH at which a buffer composed of CO32- and HCO3- would be most...

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What is the pH at which a buffer composed of CO32- and HCO3- would be most...

What is the pH at which a buffer composed of CO₃^2- and HCO₃^- would be most effective at resisting pH change? I think the answer is 10.32 but I wanted to check.

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Answer 1

Answer #1

HCO3- (aq) ------------> CO32- (aq) + H+ (aq)

if the concentrations of CO32- and HCO3- are equal .

pH = pKa2 + log [conjugate base / acid]

= 10.32 + log [CO32- / HCO3-]

pH = 10.32.

At pH = pKa , the buffer capacity is maximum. so it is the most effective resisting pH

so your answer is correct

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Answer 2

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