[nickleskovec]

Rank the following acids by the amount of H3O+ produced upon dissociation in water
1.6 mol HCl
1.2 mol HBr
1.2 mol HF

My question is this: although HBr is more acidic than HCl, how exactly does molarity affect the total acidity in water. I looked up some values online: Hydrobromic acid HBr (pKa = −8.7) Hydrochloric acid HCl (pKa = −6.3)
and attempted to multiply these values by the molar concentration, and according to the math, HCl should be more acidic, but I'm unsure if I'm approaching the problem correctly.

[sjb]

Look further, into what pKa actually stands for.