Consider 0.10 M solutions of the following substances. Which would have the lowest pH?

a.NaNO3
b.NH4NO3
c.NH4F
d.NaF

The answer is b ( NH4NO3), but I am not sure why? Can someone please explain to me how they reasoned this question?

Question

Consider 0.10 M solutions of the following substances. Which would have the lowest pH?

a.NaNO3
b.NH4NO3
c.NH4F
d.NaF

The answer is  b ( NH4NO3), but I am not sure why? Can someone please explain to me how they reasoned this question?

cherylim23 · Answer

When B dissociates in water, it will form NH4+ cations and NO3- anions.
NH4+ is a strong conjugate acid for NH3, which is a weak base, resulting in lowest pH
It is not C as I don't think NH4F will fully dissociate in water... F is very electronegative.

anonymous · Answer

Thanks :D....Do you mean D instead of F?

cherylim23 · Answer

Nope, I meant F, which is fluorine in option C. NH4+ would be a stronger acid than Na+ in option D anyway, because Na+ cannot even donate a proton...

anonymous · Answer

Okay I was just making sure....thanks again!!!