By Team Edtoolkits · Study & learning
Calculate pH, pOH, [H+] and [OH−] for strong and weak acids and bases, convert from a known pH, and find buffer pH with the Henderson–Hasselbalch equation, with working shown.
Use the guide alongside the working tool.
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Pick Strong, Weak, Buffer or From pH at the top.
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Enter the concentration and, for weak acids and bases, Ka or Kb.
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Read pH, pOH and the ion concentrations, with the working below.
Privacy and limits
Values are for 25 °C (Kw = 1.0 × 10⁻¹⁴) and ideal solutions; activity effects at high concentration are ignored. Weak acids and bases ignore water's own ions, so avoid concentrations near 10⁻⁷ M. Nothing you enter leaves your device.
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