Chemistry Calculators

Chemistry calculators on CalcMountain handle the standard quantitative work of general, organic, analytical, and physical chemistry. Whether you're a high school student working through stoichiometry homework, a college lab preparing buffer solutions, or a practicing chemist running through routine calculations, the formulas here follow the same conventions taught in the standard textbooks.

For solutions and concentrations, we have molarity, dilution (M₁V₁ = M₂V₂), and pH/pOH calculators. The pH calculator handles strong acids and bases directly, and weak acids/bases via the Henderson-Hasselbalch equation. The molar mass calculator computes molecular weights from chemical formulas using standard IUPAC atomic weights.

Reaction-stoichiometry calculators address percent yield, theoretical yield, empirical formula determination, and titration endpoint calculations. The radioactive decay and half-life calculators support nuclear chemistry and isotope-dating applications using the standard N(t) = N₀ × 0.5^(t/t½) form.

Thermodynamics and equilibrium coverage includes Gibbs free energy (ΔG = ΔH - TΔS), the equilibrium constant K, the Nernst equation for electrochemical cells, and ideal gas law calculations. The Beer-Lambert law calculator supports analytical chemistry and spectroscopy (also appears in the optics category for the same equation applied to optical density).

For colligative properties (the chemistry of dilute solutions), we have boiling point elevation, freezing point depression, and osmotic pressure calculators. These follow the standard Δ = i × K × m form using molality and the van't Hoff factor.

Atomic weights are current IUPAC values. Thermodynamic data, when needed, comes from the NIST WebBook for gas-phase thermochemistry. pKa values for common acids use standard reference values; lab-specific conditions (temperature, ionic strength) may produce small variations. For research-grade quantitative work, always validate against your specific experimental conditions and reference literature.