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sci.ph-calculator Calculator
Calculates solution pH from H⁺ concentration, weak acid dissociation constant Ka, or buffer composition. A solution with [H⁺] = 10⁻⁷ M has pH 7 (neutral at 25 °C) — pH of a 0.1 M acetic acid solution (Ka = 1.8 × 10⁻⁵) is 2.87.
Inputs
H
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Temp
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Ka
Reference formula or conversion factor shown for context.
Ca
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Results
pH
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
pOH
Reference formula or conversion factor shown for context.
[OH⁻] (mol/L)
Reference formula or conversion factor shown for context.
category
The classification bucket this result falls into based on the computed value and the applicable reference scale.
weak acid pH (√KaCa)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).