Which pair of compounds will form a buffer in aqueous solution?
NaCN and NaOH
NaCN and KCN
HCl and NaCl
HCl and NaOH
HCN and NaCN
HCN and HCl
Weak acid and its salt with strong base will be acting as buffer. The purpose of weak acid is to establish the equilibrium and controlling in both directions as per desired conditions, so the answer is HCN, and NaCN
Which pair of compounds will form a buffer in aqueous solution?