Free chemistry tools
that show their working.
Identify NMR solvent impurities, predict shifts and splitting, work out MS adducts and exact mass, balance equations, simulate titrations and draw electron configurations. Everything runs in your browser, with no account.
The NMR workflow
Four tools in the order you would use them on a real spectrum: remove the solvent peaks, predict what should be there, understand the splitting, then assign each peak to an atom.
- 01
Clean
Impurity Solver
Identify solvent impurity peaks before you trust the spectrum.
- 02
Predict
Chemical Shift Predictor
Estimate expected ¹H environments from molecular context.
- 03
Split
Splitting Pattern Simulator
See why peaks split — n+1, Pascal intensities, J-coupling.
- 04
Assign
Peak Assignment Assistant
Assign peaks to atoms with shift, multiplicity, and structure.
Guided workflows
Structure Elucidation & Characterization
Identify an unknown compound from its spectra.
Shift Predictor
Estimate expected ¹H shifts from functional groups & environment.
Splitting Sim
n+1 multiplicity, Pascal intensities & J-coupling, visualised.
NMR Solver
Identify trace solvent & impurity peaks from ¹H / ¹³C shifts.
Peak Assignment
Assign ¹H peaks to atoms from shift, multiplicity & structure.
MS / Exact Mass
Compute exact mass, isotope patterns & ESI adduct m/z.
Reaction & Quantitative Analysis
From a balanced equation to lab measurements.
Atomic & Structural Foundations
From electron structure to bonding & reactions.
Every chemistry tool
NMR Peak Assignment Assistant
Assign ¹H NMR peaks to atoms using shift, multiplicity, spectrum and molecule canvas — evidence-first workspace.
NMR Splitting Pattern Simulator
Interactive ¹H n+1 splitting, Pascal intensities, and J-coupling — visualize why peaks split.
NMR Chemical Shift Predictor
Estimate expected ¹H NMR chemical shifts from functional groups and molecular environment — deterministic, browser-based.
NMR Impurity Solver
Instantly identify NMR solvent impurities. Search by shift (ppm) and solvent.
Chemical Equation Balancer
Balance molecular and ionic equations with exact coefficients, conservation checks, and mass–mole stoichiometry.
Electron Configuration Viewer
Explore quantum subshells, orbital diagrams, and quantum numbers for all 118 elements.
MS Adduct & Exact Mass Calculator
Calculate isotopic patterns, exact mass, and MS/MS peptide cleavage points. Search reverse formulas perfectly.
Titration Simulator
Acid–base, redox, and complexometric titration curves with Veq, indicators, and CSV export for lab practice.
Ideal Gas Law Calculator
Solve for pressure, volume, moles, or temperature using the PV=nRT equation with smart unit conversion.
Chemistry guides
Frequently asked questions
What is the Jaconir Chemistry Lab?
A set of free chemistry tools that run in your browser, grouped into guided workflows: structure elucidation with NMR and mass spec, reaction stoichiometry and titration, and atomic structure. Every tool also works on its own page — the Lab just puts the natural next step one click away.
Do the tools use AI?
No. Every result comes from explicit rules you can check: the impurity solver matches your shifts against published solvent impurity tables, and the splitting simulator applies n+1 and Pascal intensities. When a tool cannot answer confidently, it says so instead of producing a number that looks like an answer.
Is my data uploaded anywhere?
No. Shifts, formulas and values you enter are processed in the page itself and are not sent to a server. There is no account to create, so there is nothing to attach them to either.
Can I use the results in coursework or published research?
Yes, with no attribution required. For published work, treat these tools as a first pass and confirm anything load-bearing against your primary software — they are built for the check you make before opening MestReNova or TopSpin, and for coursework where that software is not available at all.
Are the tools free?
Yes. There is no paid tier and no trial. The site is paid for by advertising, and nothing you put into a tool is part of that.
Jaconir also builds free 2D game development tools.