Instant PH/ POH Calculator

pH & pOH Colorful Calculator
pH

pH & pOH Colorful Calculator

Compute pH, pOH, [H⁺], [OH⁻] and visualise indicator colours for common acid-base indicators.

Notes:
  • For inputs of [H⁺] or [OH⁻] provide molar concentrations (M).
  • % w/v is interpreted as grams solute per 100 mL solution (used only for approximate pH if substance is strong acid/base).
  • Temperature adjusts KW: KW = 1e-14 at 25°C (default approximation used).
Formulas & quick references:
pH = -log10[H⁺] • pOH = -log10[OH⁻] • [H⁺] = 10^-pH • [OH⁻] = 10^-pOH • pH + pOH = pKw
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