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sci.pH-strong-acid Calculator
Calculates pH of strong acid or base solutions accounting for water self-ionisation at very low concentrations (< 10⁻⁶ M). At 10⁻⁷ M HCl, water contributes equally — solve charge balance [H⁺] = c_acid + Kw/[H⁺] to get pH ≈ 6.79, not 7 as naïve calculation gives.
Inputs
C Mol L
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Ka Dissociation
Reference formula or conversion factor shown for context.
Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
pH
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
pOH
Reference formula or conversion factor shown for context.
[H⁺] (mol/L)
Reference formula or conversion factor shown for context.
[OH⁻] (mol/L)
Reference formula or conversion factor shown for context.
strong acid: pH = -log[C]
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
temperature effect
The change in the property attributable to the temperature difference. Many material properties are temperature-dependent.