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Buffer exercise 2

Human blood is a natural buffer which has an average carbon dioxide concentration of around 0.0022 mol dm-3. This is in equilibrium with a hydrogencarbonate ion concentration of around 0.024 mol dm-3. The Ka for the following equilibrium is 4.5 × 10-7 mol dm-3:

H2O(l) + CO2(aq) HCO3-(aq) + H+(aq)

What is the pH of human blood?

Answer

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