The best replacement for alkali is alkaline.

The best alternatives to alkali are rated as following:
★★★★★  alkaline
★★★  base
★★  acid
  acidic
  acid chemistry

Your alternative for alkali is not listed? Suggest!
Speaking about alkali, one probably shouldn't forget about preesall.

Other search terms related to alkali and their ratings are:
★★★★★ preesall
★★★★★ cocoa
★★★★★ ammonium salt
★★ universal indicator
★★ halogens
★ carbohydrates
ammonium salts
You have in mind a companion for alkali and it is not yet here? Propose!



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alkali
alkaline
base