The best replacement for ph is pka.

The best alternatives to ph are rated as following:
★★★★★  pka
★★★★★  temperature
★★★★  poh
★★★★  alkalinity
★★★  concentration
★★  acidity
★★  conductivity
★  ph
★  orp
★  volume graph
★  pah
★  f
★  pi
★  mv
★  alkalinity first
★  charge
★  gh
  litmus paper
  absorbance
  eurgh
  temperature on the activity of an enzyme
  pka values
  dizaster
  solubility
  very high temperatures affect enzyme activity
  titratable acidity
  h+
  specific gravity
  pk
  enzyme activity
  volume of naoh
  chemical shift
  hydrogen ion concentration
  sodium hydroxide concentration
  acid
  ammonia concentration

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

Other search terms related to ph and their ratings are:
★★★★★ ka
★★★ raising alkalinity
★★ molarity
★★ water
★★ kb
★★ hydrogen ion concentration
★ buffers
★ pka
★ chemicals
★ lowering alkalinity
★ increasing alkalinity
alkalinity
h+
buffer
raising total alkalinity
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ph
pka
temperature