For a weak monoprotic acid with pKa=7.0, which species is expected to predominate in a solution whose pH is 5.0?
a) The deprotonated form, A−, because [A−]/[HA]=102 when the pH is two units different from the pKa.
b) The protonated form, HA, because pH is below pKa.
c) There is insufficient information to determine which species predominates because the acid’s concentration is not specified.
d) The deprotonated form, A−, because pH is below pKa.