You open a 16 oz (1 pint) bottle of a carbonated soft drink that has a temperature of 5°C, then you get distracted and forget to drink it. You come back quite some time later and find that it has gone "flat," and that it has gotten warm (20°C). Before it was opened, assume that the pressure in the bottle was 1.5 atm, the bottle had a headspace of 20 mL, and the headspace contained 90% CO2. Also assume that the soft drink contains no significant concentrations of ions other than carbonate species and dissociation products of water. a. What is the pH of the "flat" soft drink if atmospheric CO2 is 390 ppmv? b. What was the pH of the soft drink before it was opened? c. How many milligrams of CO2 were released to the atmosphere from when the soft drink was first opened until it went "flat?"