Interactive pH and fractional-composition plots for mono- through pentaprotic weak acids titrated with strong base.
Controls
Titration Curve Lookup
Lookup result
Enter a volume or pH to calculate a corresponding value on the titration curve.
Model assumptions: weak polyprotic acid titrated with strong base. pH is computed with a charge-balance solver using polyprotic distribution fractions. Fractional composition is computed from the same alpha fractions.
Graphical Output
pH Titration Curve
Green curve = pH vs. added base volume. Gold marker = selected point. White crosshair = live hover. Purple dashed curve = first derivative overlay when enabled.
Live hover coordinates
Live hover coordinates are turned off.
Selected pH plot point
Click the pH curve to view x,y coordinates.
Fractional Composition of Acid Species vs pH
This plot is an alpha-distribution diagram: each curve shows the fraction of total acid present as a given species at each pH.