# Free Online Chemistry Tools: Equation Balancer, Molar Mass, Periodic Table, pH, Titration

> Free chemistry tools in your browser: balance chemical equations, molar mass and mass percent, interactive periodic table, pH, titration curves, gas laws, solution concentration and dilution, stoichiometry and limiting reagents, empirical formulas, electron configuration, VSEPR shapes, enthalpy and Gibbs free energy, ICE tables, Nernst equation, oxidation numbers and half-life. Everything is computed locally.

- URL: https://qilingtools.com/en/chemistry
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

## Tools (35)

- [Significant Figures Calculator](https://qilingtools.com/en/math/significant-figures): Free online sig fig calculator: count significant figures digit by digit, round to N sig figs or decimals with six rounding modes, and compute by sig fig rules.
- [Chemical Equation Balancer](https://qilingtools.com/en/math/chemical-equation): Balance chemical equations by the algebraic method: smallest whole-number coefficients, brackets, hydrates, ionic charges, electrons, atom and charge checks.
- [Molar Mass Calculator](https://qilingtools.com/en/math/molar-mass): Molar mass of any formula with IUPAC atomic weights: brackets and hydrates, mass percent of each element, grams ↔ moles ↔ particles and solution molarity.
- [Interactive Periodic Table](https://qilingtools.com/en/math/periodic-table): Interactive periodic table of all 118 elements: colour by category, block, electronegativity, atomic mass, phase or melting point; search and click for details.
- [pH Calculator](https://qilingtools.com/en/math/ph): Free pH calculator for strong and weak acids and bases, polyprotic acids, salts and buffers, with an exact charge-balance solution and species plots.
- [Titration Curve](https://qilingtools.com/en/math/titration): Free acid-base titration curve simulator: exact curves for strong, weak and polyprotic acids and bases, equivalence-point pH, the jump and indicator picks.
- [Gas Law Calculator](https://qilingtools.com/en/math/gas-law): Free gas law calculator: solve PV=nRT for any variable, combined gas laws, gas density, Dalton's partial pressures, gas over water and van der Waals Z.
- [Solution & Dilution Calculator](https://qilingtools.com/en/math/solution): Free dilution calculator: solve C1V1=C2V2, convert molarity, % w/w, ppm and molality, mix solutions, plan serial dilutions and dilute stock acids.
- [Stoichiometry & Limiting Reagent](https://qilingtools.com/en/math/stoichiometry): Balances the equation, finds the limiting reactant from grams, moles, gas volume or molarity, and gives theoretical yield, excess and percent yield with steps.
- [Empirical & Molecular Formula](https://qilingtools.com/en/math/empirical-formula): Find the empirical and molecular formula from mass percent, element masses or combustion data (CO₂, H₂O, N₂), with a whole-number ratio search and full working.
- [Electron Configuration Calculator](https://qilingtools.com/en/math/electron-config): Free electron configuration calculator for any element or ion (Fe3+, O2-): full and noble-gas notation, an orbital diagram, unpaired electrons and shells.
- [VSEPR Molecular Geometry](https://qilingtools.com/en/math/vsepr): Free VSEPR calculator: enter SF4, NH4+ or SO4^2- for the steric number, lone pairs, AXE notation, electron and molecular geometry, angles and hybridization.
- [Reaction enthalpy & Gibbs energy](https://qilingtools.com/en/math/thermochem): Free ΔH, ΔS and ΔG calculator: type an equation, it balances it and looks up enthalpies of formation, then gives K, crossover temperature and spontaneity.
- [Chemical equilibrium (ICE)](https://qilingtools.com/en/math/equilibrium): Free equilibrium calculator: enter a reaction, K and initial concentrations for the ICE table, exact concentrations, Q vs K and the 5% rule check.
- [Cell Potential & Nernst Calculator](https://qilingtools.com/en/math/electrochem): Standard reduction potential table with cell reaction, notation, E°cell, ΔG° and K, plus Nernst equation, concentration cells and Faraday electrolysis.
- [Oxidation Number Calculator](https://qilingtools.com/en/math/oxidation-number): Oxidation numbers for any formula or ion with step-by-step rules, plus redox equation analysis: oxidizing and reducing agents and electrons transferred.
- [Half-Life Calculator](https://qilingtools.com/en/math/half-life): Solve radioactive decay for any unknown with 30+ isotopes: decay constant, activity in Bq and Ci, carbon-14 dating and first-order kinetics.
- [Ksp Calculator](https://qilingtools.com/en/math/ksp): Free solubility product calculator with 80 Ksp values at 25 °C: Ksp to molar solubility, the common-ion effect, Q vs Ksp precipitation and hydroxide pH.
- [Colligative Properties Calculator](https://qilingtools.com/en/math/colligative): Free colligative properties calculator: freezing point depression, boiling point elevation, osmotic pressure and Raoult's law, with Kf/Kb and molar mass.
- [Chemical Kinetics Calculator](https://qilingtools.com/en/math/kinetics): Free chemical kinetics calculator: reaction orders and k with units by initial rates, zero, first and second-order rate laws, and Ea from the Arrhenius plot.
- [Calorimetry & Specific Heat Calculator](https://qilingtools.com/en/math/calorimetry): Free calorimetry calculator: solve q = mcΔT with a specific heat table, find the final temperature of mixtures, get ΔH from coffee-cup and bomb calorimetry.
- [SMILES Molecule Viewer](https://qilingtools.com/en/math/smiles): Free online SMILES viewer: draw a 2D skeletal structure and get the formula, molar and exact mass, unsaturation, rings, H-bond counts and a Lipinski check.
- [Isotope Pattern Calculator](https://qilingtools.com/en/math/isotope-pattern): Free isotope pattern calculator: enter a formula, pick M, [M+H]+, [M+Na]+ or [M−H]− and get monoisotopic m/z, average mass and the isotope distribution.
- [Unit Cells & Crystal Structures](https://qilingtools.com/en/math/crystal): Interactive 3D unit cells (SC, BCC, FCC, HCP, NaCl, CsCl, ZnS, diamond, perovskite) with atoms per cell, coordination number, packing efficiency and density.
- [Light Energy & Atomic Spectra](https://qilingtools.com/en/math/spectroscopy): Convert wavelength, frequency and photon energy (eV, J, kJ/mol), compute hydrogen spectral lines, photoelectric stopping potential and de Broglie wavelength.
- [Beer–Lambert & Calibration Curve](https://qilingtools.com/en/math/beer-lambert): Free Beer-Lambert calculator: solve A = εbc for any variable, convert absorbance and %T, and fit a calibration curve with R², unknowns, 95% CI and LOD/LOQ.
- [Ionic Compound Formula & Naming](https://qilingtools.com/en/math/ionic-compound): Write ionic formulas from cation and anion by criss-cross, name compounds from formulas and find formulas from names, with acids, hydrates and a quiz.
- [IUPAC Name Generator](https://qilingtools.com/en/math/organic-name): Name organic compounds from SMILES: IUPAC 2013 and traditional names, highlighted parent chain and step-by-step reasoning. Also name-to-structure and a quiz.
- [Isomer Generator](https://qilingtools.com/en/math/isomers): List every structural isomer of a formula like C5H12, C4H10O or C3H6Cl2, with drawings, IUPAC names, SMILES, class counts and stereoisomer totals.
- [Molecular Orbital Diagram](https://qilingtools.com/en/math/mo-diagram): MO diagrams for H₂–Ne₂, O₂²⁻, N₂⁺, CO, NO, CN⁻ and HF with Hund’s-rule filling: MO configuration, bond order, unpaired electrons, magnetism and HOMO/LUMO.
- [Born–Haber Cycle Calculator](https://qilingtools.com/en/math/born-haber): Born–Haber cycle for NaCl, MgO, CaF₂, Al₂O₃ and more: built-in data, lattice energy or any unknown via Hess’s law, a scaled diagram and Kapustinskii comparison.
- [Net Ionic Equation Calculator](https://qilingtools.com/en/math/net-ionic): Free net ionic equation calculator: it balances the equation, splits strong electrolytes by solubility rules, cancels spectator ions and checks the charge.
- [IR Spectroscopy Table](https://qilingtools.com/en/math/ir-table): Free interactive IR correlation table: 60+ functional group bands with range, intensity and shape on a 4000–400 cm⁻¹ chart; enter peaks to identify groups.
- [¹H NMR Spectrum Simulator](https://qilingtools.com/en/math/nmr): Simulate ¹H NMR spectra at 60–600 MHz from shifts, integrals and J values: splitting trees, multiplicity (t, q, dd, dt), journal peak lists and a shift table.
- [Peptide & Protein Calculator](https://qilingtools.com/en/math/peptide): Peptide calculator: formula, monoisotopic and average mass, pI with charge vs pH curve, extinction coefficient, GRAVY, ESI m/z and DNA-to-protein translation.