Chemistry
How to use?
Tools that model chemical phenomena: from input data to results, with theory and visualizations included.
Who is it for?
University students, educators, and lab professionals who need to solve calculations accurately and understand the model behind each result.
How to use them?
Pick a tool, enter the values, and read the result. Each one includes a Fundamentals section with the underlying theory and formulas.
Scope
Covers the main quantitative problems in chemistry and expands with new tools regularly. If you need something that isn't here, reach out from the Contact section.
13 calculators · 9 widgets
DilutionsCalculate final volume or concentration using C₁·V₁ = C₂·V₂
Monoprotic TitrationSimulate acid-base titration curves for all 4 monoprotic types with real-time pH calculation
Advanced StoichiometryBalance molecular and ionic equations. Calculate limiting reagent, excesses and yields with interactive periodic table
Interactive Periodic TableExplore all 118 elements in the real IUPAC layout with an expanded interactive property card
Ideal Gas and Van der WaalsCompute ideal and real gases (Van der Waals): equations of state, compressibility factor Z and P-V isotherms
Commercial Solutions & ReagentsCompute molarity, molality, normality and mass concentration of commercial reagents from formula, purity and density
Buffer Solutions (Henderson-Hasselbalch)Analyze buffer equilibria or design solutions from scratch. Compute pH, buffer capacity (β), species fractions (α) and reagent masses with Henderson-Hasselbalch.
Thermodynamic Equilibrium: Gibbs-HelmholtzAnalyze spontaneity and thermodynamic equilibrium with ΔG° = ΔH° − TΔS°. Compute equilibrium constant Keq, inversion temperature and visualize all four thermodynamic quadrants
Galvanic Cell (Nernst)Compute the real cell potential (E_cell) of an electrochemical cell using the thermodynamically exact Nernst equation. Returns E°, K_eq, ΔG, ΔG°, Q, and maximum electrical work, with classic presets (Daniell, Ag/Cu, Mg/Cu, SHE) and an animated cell SVG.
Arrhenius CalculatorCompute rate constant, activation energy, and pre-exponential factor with the Arrhenius equation
Colligative Properties: Ideal SolutionsCalculate boiling point elevation, freezing point depression, osmotic pressure and vapor pressure lowering (Raoult & Antoine equation) for ideal dilute solutions with non-volatile solutes. Configurable Van't Hoff factor
Ionic Dissociation & Van't Hoff FactorRelates the degree of dissociation α, the number of ions ν, and the Van't Hoff factor i. Gets α from the weak-electrolyte equilibrium (Ka), a colligative measurement (ΔTf, ΔTb, Π), or as a given value, and estimates strong-electrolyte non-ideality with Debye-Hückel (γ±, osmotic coefficient φ and effective i)
ICE Table: Chemical EquilibriumSolves the equilibrium of a reversible reaction aA + bB ⇌ cC + dD with the ICE-table method: computes the extent of reaction x, the equilibrium concentrations, the shift direction (Q vs K), the limiting-reactant conversion and the validity of the 5% approximation, in Kc or Kp mode