2. A soft drink has a pH around 2.7 due partially to its high H2CO3
 content. 
a. If all the acidity in the beverage was generated by bubbling it with pressurized CO2(g), what 
PCO2
    Would have been required in the bubbles? 
b. What would the pH of the solution be if it was in equilibrium with a PCO2 of 4 atm? 
c. The pH of the solution is actually kept low by a combination of dissolved CO2 plus 
phosphoric acid. Assuming PCO2 is 4 atm in the bottle, what concentration of H3PO4 must be 
added to solution to reach pH 2.7?

14. In deciding which of two acids is the stronger, one must know: A) the concentration of each acid solution B) the pH of each acid solution C) the equilibrium constant of each acid D) all of the above E) both A and C. 15. Solid calcium hydroxide is dissolved in [OH 1 of the solution is water until the pt of the solution is 11.35. The hydroxide ion concentration A) 4.5× 10-12 M. B) 4.5× 103M C) 2.2× 10-3M. D) 1.1 x 103M E) none of these. 16. What volume of water must be added to 11.5 ml. of a płI 2.0 solution of HNO, in order to change the pH to 4.0 A) 11.5 mL B) 89 mL C) 114 mL D) 1.14 x 103 mL E) 29 ml 17he phi of HoCI is 7.5. Calculate the pł of a 0.39 M solution of HOCL A) 7.50 B) 6.50 C) 3.95 D) 10.05 E) 0.39 3