Question

Which of the following aqueous solutions are good buffer systems? 0.18 M hydrocyanic acid + 0.19 M hydroiodic acid 0.30 M ammonia + 0.35 M ammonium nitrate 0.32 M sodium nitrate + 0.27 M potassium nitrate 0.25 M perchloric acid + 0.25 M sodium perchlorate 0.11 M barium hydroxide + 0.25 M barium chloride

Answer 1

acidic buffer is formed by weak acid and salt of weak acid
basic buffer is formed by weak base and salt of weak base

Option 1:
Both of them are acid.
They cant form buffer

Option 2:
NH3 is base and NH4+ is conjugate acid.
They will form basic buffer

Option 3:
NaNO3 and KNO3 are both neutral salt.
They cant form buffer

Option 4:
HClO4 is strong acid and NaClO4 is neutral.
They cant form buffer

Option 5:
Ba(OH)2 is strong base and BaCl2 is neutral salt.
They cant form buffer

Answer: option 2