# Problem: 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?

###### FREE Expert Solution

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:

$\overline{){{\mathbf{S}}}_{{\mathbf{gas}}}{\mathbf{=}}{{\mathbf{k}}}_{{\mathbf{H}}}{{\mathbf{P}}}_{{\mathbf{gas}}}}$

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.

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###### Problem Details

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?