Chemistry

15 calculators: molarity, molality, molar mass (from chemical formula), moles ↔ mass ↔ atoms, mass percent, dilution (M₁V₁ = M₂V₂), pH / pOH from [H⁺], buffer pH (Henderson-Hasselbalch), ideal gas law (PV = nRT), Boyle's & Charles's laws, radioactive half-life, empirical formula from mass %, Avogadro / mole conversion, density, and solution concentration (mg/L ↔ ppm ↔ %).

Type the formula like H2O or NaCl or C6H12O6. The calculator parses element symbols and subscripts, sums atomic masses from a lookup table covering H to common metals. For complex organic compounds with parentheses (e.g. Ca(OH)2), expand manually for now — parenthesis-parsing is on the roadmap.

Yes — covers ICSE / CBSE / IB / AP Chemistry topics at the level of stoichiometry, acid-base, gas laws, and basic kinetics. Quantum chemistry (orbitals, hybridization) needs a different tool.

Neutral pH = 7 only at 25°C. At body temperature (37°C), neutral pH ≈ 6.81. The calculator doesn't apply temperature correction — use it at standard conditions or apply the correction manually.

Input element:mass% pairs. The calculator divides each by the element's atomic mass to get mole ratios, then normalizes to the smallest. Whole-number rounding works for simple molecules; complex hydrates may need manual adjustment.

pH = pKa + log([A⁻]/[HA]). Used to compute the pH of a buffer solution. Type pKa and the concentrations of conjugate base and weak acid — get the buffer's pH instantly.