Joanna is performing a reaction that generates a moderate amount of hydroxide. To mimic biological conditions (most bodily fluids in living organisms retain a relatively constant pH around 7) , she knows that she needs to add a buffer to the reaction. Which of the following will MOST effectively neutralize the OH− ions produced by the reaction?
Select the correct answer below:
a. A buffer containing HCl and NaCl in equal concentrations
b. A buffer containing NH3 and NH4Cl in equal concentrations
c. A buffer containing H3PO4 and H2PO−4, with a slight excess of H3PO4
d. A buffer containing NH3 and NH4Cl, with a slight excess of NH3
