The best replacement for pka is ka.

The best alternatives to pka are rated as following:
★★★★★  ka
★★★★★  ph
★★★  pkb
★★★  pi
★★  acidity
★  pkc
★  pka
★  ph relationship
★  ph ionization
  acid strength
  equivalence point
  ka chemistry
  ionic strength
  pk
  lower pka

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

Other search terms related to pka and their ratings are:
★★★★★ ph
★★★ ka
★★ titration curve
You have in mind a companion for pka and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pka in all years. Click on graph for more.
pka
ka
ph