To treat with alkali or convert into an alkaline substance; to make alkaline.
From alcali (alkali) plus -ize suffix (to cause to become or treat with), following standard English word-formation patterns.
The verb 'alcalizate' belongs to a dying breed of technical jargon—modern chemists would just say 'alkalize', showing how language simplifies as it modernizes.
Complete word intelligence in one call. Free tier — 50 lookups/day.