We’re being asked to determine the pressure of CO2 at 25 ˚C to maintain the CO2 concentration at 0.10 M in a can of lemon-lime soda.
Recall that the solubility of a gas is given by Henry’s law:
where Sgas = solubility of the gas (in mol/L or M), kH = Henry’s law constant for the gas, Pgas = partial pressure of the gas.
The Henry’s law constant for CO2 is 3.4 × 10−2 M/atm at 25 °C. What pressure of carbon dioxide is needed to maintain a CO2 concentration of 0.10 M in a can of lemon-lime soda?
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