Which of the following mixtures has the lower pH

a) equal volumes of 0.10M HClO4 and 0.10M NaOH

b) equal volumes of 0.10M HClO4 and 0.10M NH3

my guess would have to be that NaOH is a stronger base (high pH)
and NH3 is a weak base (so a lower pH)

so NH3 has a lower pH because it isn't as basic as NaOH