Ka=/frac{[H^+][A^-]}{[HA]}
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Recent Referers:
  1. http://formula.s21g.com/?Ka=/frac%7B[H%5E+][A%5E-]%7D%7B[...
  2. http://formula.s21g.com/?Ka=/frac%7b%5bH%5e+%5d%5bA%5e-%5...