The solubility of CO 2 gas in water is 0.15g / 100 mL at a CO 2 pressure of 760
ID: 519625 • Letter: T
Question
The solubility of CO2 gas in water is 0.15g / 100 mL at a CO2 pressure of 760 mmHG.
a) what is the solubility of CO2 in a soft drink (which is mainly water) that was bottled under a CO2 pressure of 4.5atm?
=0.68g/100mL
b) An atmospheric concentration of 380 ppm, CO2 corresponds to a partial pressure of 0.00038 atm. What percentage of the CO2 originally disolved in the solution in part (a) remains in the solution after the soft drink reaches equilibrium with the ambient atmosphere?
c) One bottle of soda is stored in a refrigerator at 3°C, and another is stored at room temperature (25°C). If both bottles are opened simultaneously, which one would exhibit greater carbination (i.e, bubbles)? Explain why
Explanation / Answer
a.) solubility of a solute (gm/lit) in solvent is determined based on Henry's law, which is as follow...
pressure = solubilty * henry's law solubility constant
p = x * k
or, k = (p/x) = (760 mm / 0.15 gm/100 ml)
next for other case...
solubity in a soft drink...
x = (p/k) = (4.5 atm * 760 mm) / (760 mm / 0.15 gm/100 ml) = 0.675 gm / 100 ml = 0.68 gm /100 ml
c) the bottle stored at refrigerator will exhibit more carbination. because...
solubility of carbon di oxide is decrease with increase in temperature. hence, bottale at room temeperature has lower amount of dissolve CO2 compared to the refrigerator's bottle.