An aqueous solution contains 0.27 M ammonium chloride, NH4Cl. One liter of this solution could be converted into a buffer by the addition of:
a. 0.13 mol HCl
b. 0.26 mol KCl
c. 0.26 mol NH3
d. 0.27 mol HBr
e. 0.27 mol KOH
Answer: C
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