Purple and lime green homecoming dress?
Limes are ALKALINE. Either a food is alkaline or acidic to the body pH depends only on the effect it has inside the body, and not if it contains acid, or tastes sour or whatever. Limes have an alkalizing effect because they have a high water but low sugar content, and also because they contain a lot of alkaline minerals.
Acidic. You need to seek advice from a gardener face to face.