An aqueous solution contains 0.26 M hydrocyanic acid, HCN. One liter of this solution could be converted to a buffer by the addition of:
a. 0.13 mol HBr
b. 0.26 mol KBr
c. 0.27 mol HBr
d. 0.13 mol KOH
e. 0.13 mol NH3
Answer: D
Chemistry
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