Where does “aciditas” come from?

aciditas (Latin) comes from Latin acidus, from Latin aceō, from Proto-Italic akēō, from Proto-Indo-European h₂eḱ-éh₁-ye-ti, from Proto-Indo-European h₂eḱ- — sharp.

Ancestry of “aciditas”, step by step

Step	Language	Word	Meaning
1	Latin	acidus	sour, tart, acid, bitter; harsh, grating, rough,...
2	Latin	aceō	—
3	Proto-Italic	akēō	be sharp-tasting, be sour
4	Proto-Indo-European	h₂eḱ-éh₁-ye-ti	—
5	Proto-Indo-European	h₂eḱ-	sharp

Every word from Proto-Indo-European h₂eḱ- →

aciditas — Etymology, Origin & Word History | Etymology Explorer