You are designing a system to add CO2 to water to make carbonated water (sparkling water,...

You are designing a system to add CO2 to water to make carbonated water (sparkling water, like Club Soda or Perrier). If the gas pumped into the bottle above the water is at a pressure of 2 atmospheres and is composed of 100% CO2, what is the equilibrium concentration of dissolved CO2 in the water? If the pH of the water is 5.0, what is the concentration of CO3^-2, HCO3-, and H2CO3 ? (KH=0.0334 mol/L*atm)
CO2(aq) + H2O<-----> H2CO3

H2CO3 <----> H^+ + HCO3^- pKa=6.35
HCO3^- <------> H^+ + CO3^2- pKa=10.33

Please show step by step solution. Thank you.

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Expert Solution

ANSWER
CO2(aq) + H2O -----> H2CO3

where g and aq refer to the gaseous and dissolved phase, respectively. Although the concentration of CO2(aq) far exceeds that of dissolved H2CO3 (in the order of 103 ) we denote the concentration of all dissolved CO2 by [H2CO3]. The equilibrium condition between the phases is quantified by the molar solubility .

queen_honey_blossom answered 4 months ago

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