Mixtures & Solutions
Solutions
Calculators & Tools
Activity Coefficient Calculator
The Activity Coefficient Calculator computes ionic strength directly from a list of ions and their concentrations, then estimates the activity coefficient (gamma) for a target ion using three standard models side by side: Debye-Hückel limiting law, Extended Debye-Hückel (with a built-in ion-size parameter lookup), and the Davies equation. Each result is flagged if it falls outside that model's valid ionic strength range.
Alkalinity Calculator
The Alkalinity Calculator computes total alkalinity in mg/L as CaCO3 either from titration data (titrant volume, acid normality, sample volume) or from known carbonate, bicarbonate, and hydroxide concentrations. Its Convert & Compare mode converts between mg/L, meq/L, and dKH and checks the result against drinking water, pool, freshwater aquarium, and reef aquarium target ranges side by side.