6th Edition 12.59

[Fionna Shue 4L]

Calculate the pH, pOH, and percentage protonation of solute in each of the following aqueous solutions: (a) 0.057 m NH3(aq); (b) 0.162 m NH2OH(aq); (c) 0.35 m (CH3)3N(aq); (d) 0.0073 m codeine, given that the pKa of its conjugate acid is 8.21.

For parts b, c, and d, how are we supposed to determine if the molecule is an acid or base?

[Helen Zhao 1F]

They're all bases because the question says "given that the pka of its conjugate acid". "its" refers to the molecules listed in each subsection (a, b, c, d) and because the question says conjugate acid, then "its" are bases.

[Michael Torres 4I]

Because the question asks for the percentage protonation of the following solutes, then you can assume that the solutes that are given are bases. Bases can become protonated whereas acids become deprotonated.