Question

Which three substances' conjugates cannot act as buffers?

i.e. There are no weak conjugates in the compounds.
NH3
C6H5COOH
H3PO4
NaHCO3
C5H5N
HBr
HF
NaOH
HClO4

Answer 1

I thought I answered this for you last week.

HBr, NaOH, HClO4.