Illustrated Glossary of Organic Chemistry

Proticity: Characterization of a substance as protic (a hydrogen bond donor) or aprotic (incapable of donating a hydrogen bond). Not to be confused with proticity in biology, which is an electrical current generated by a flow of protons (instead of a flow of electrons).

Acetone is a common aprotic solvent. It lacks a hydrogen atom with sufficiently large δ⁺ so acetone is not a hydrogen bond donor.

Methanol is a common protic solvent. The O-H bond has a large δ⁺ on the hydrogen atom, so methanol can be a hydrogen bond donor.