The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. Calculate the molarity of aqueous CO solution at the normal partial pressure of CO of 0.00036 atm?

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Quizplus · Accepted Answer

The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. This means that 1 mL of water can dissolve 0.0354 mg of CO. The molar mass of CO is 28.01 g/mol. Therefore, 0.0354 mg of CO is equal to 0.0354 mg / 28.01 g/mol = 1.26 × 10^-6 mol of CO. Since 1 mL of water is equal to 1 cm^3, the molarity of the aqueous CO solution is 1.26 × 10^-6 mol / 1 cm^3 = 1.26 × 10^-6 M. At the normal partial pressure of CO of 0.00036 atm, the solubility of CO in water is reduced by a factor of 1 atm / 0.00036 atm = 2778. Therefore, the molarity of the aqueous CO solution at the normal partial pressure of CO is 1.26 × 10^-6 M / 2778 = 4.5 × 10^-10 M.

The Solubility of CO in Water at 0°C and 1