Initial Cost Estimates For The Iraq War Were Almost Too Low To Believe. The U.S. will shell out somewhere as much as $6 trillion dollars for the Iraq War, once all is said and done, according to a recent report out of Brown University. According to Reuters, that figure includes $1.7 trillion spent so far with an additional $490 billion in benefits.
Best Answer: A solution has the greatest buffering capacity when the concentration of the weak acid is = at the concentration of its conjugate base. In this case i thing that the correct answer is c. Source(s): Dr.A Â· 6 years ago.
On chemical grounds, a substance with a pKa of 6.1 should not be a good buffer at a pH of 7.4 if it were a simple buffer. The system is more complex as it is open at both ends (meaning both [HCO 3 ] and pCO 2 can be adjusted) and this greatly increases the buffering effectiveness of this system.