118 elements · 36 tools · free

The whole table, assembled.

Scroll, and every element finds its place. Then we go down through the four scales a chemist actually works at — bench, solution, molecule, atom — with a live tool at each one.

Open the workspace

0of 118 placed

10⁻¹m

Act I

the bench

Will it precipitate?

Pick a cation and an anion. The answer comes with the rule it came from, not just a colour — because the rule is the thing you have to remember in the exam.

Open Solubility Table →

10⁻³m

Act II

the solution

A buffer is just a ratio.

Move the two concentrations and watch Henderson–Hasselbalch do its work. The colour strip is what universal indicator would actually show you. Buffer capacity is there too, because that is the part students get wrong.

Conjugate pair

[HA] weak acid 0.10 M

[A⁻] conjugate base 0.10 M

Open Buffer Calculator →

7.00

pK_a 4.76

7.00

Ratio A⁻/HA: 1.00
Buffer capacity β: 0.115
Useful range: 3.8–5.8

10⁻⁹m

Act III

the molecule

Which atom actually lost the electrons?

Oxidation states, assigned from the standard rules and solved for whatever is left over. It is the step that decides which half-equation you write, and it takes one line here instead of five on paper.

Any formula, any ion

Electron ledger

Σ oxidation = 0

−80+8

Each dot is one electron formally transferred. Bars to the right are electrons lost, to the left electrons gained.

Oxidation states · live Oxidation States →

10⁻¹⁰m

Act IV

the atom

The bottom of the descent is a box with two arrows in it.

Slide through all 118 elements and watch the orbitals fill in Madelung order, Hund’s rule and all. Everything above this — the precipitate, the buffer, the oxidation state — is decided here.

Z = 26

Iron

55.845 · Transition metal

Atomic number 26 / 118

[Ar] 3d6 4s2

Electron Config → Quantum Numbers → Periodic Table →

Every tool on the way down.

Thirty-six of them, in four families, all in the same workspace and all free. Nothing is behind a sign-in.

Calculate

The arithmetic of the bench — concentrations, buffers, yields, cell potentials.

Buffer CalculatorHenderson–Hasselbalch and buffer capacity Concentration HubConvert between concentration units Dilution HubDilutions, stock prep and serial dilutions ElectrochemistryCell potentials and Nernst equation

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Equation BalancerBalance complex equations automatically Formula FinderEnter what you know, get the formula solved Gas LawsIdeal, Boyle, Charles and Gay-Lussac Gravimetric AnalysisAnalyte mass from precipitate weight Molar MassPrecise molar mass from any formula pH & Buffer HubpH, pOH and buffer preparation in one place Preparation LabWork out how to prepare any solution Solution WizardStep-by-step guide to complex solutions ThermochemistryHeat transfer, enthalpy and Gibbs free energy Titration CalculatorUnknown concentrations from titration data Unit ConverterConvert between every unit chemistry uses

Analyse & simulate

Data in, meaning out. Fits, spectra, mechanisms, predicted properties.

Batch PropertiesDescriptors for a list of SMILES, exportable Graph WorkbenchPlot, curve-fit and analyse data Mechanism AnimatorAnimate organic reaction mechanisms ML PredictorPredict properties with a local AI model

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SpectroscopyNMR, IR and mass spectra with peak matching Synthesis StudioDesign pathways and explore retrosynthesis Titration SimulatorInteractive acid-base titration curves

Structure & bonding

Why a molecule behaves the way it does — shape, electrons, stereochemistry.

Coordination AnalyzerComplexes and crystal field theory Electron ConfigFull and noble-gas shorthand configurations Molecular ViewerRotate and inspect molecules in 3D Nomenclature LabIUPAC names built from transparent rules

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Organometallic Analyzer18-electron rule and catalytic cycles Oxidation StatesOxidation numbers for every element present Quantum NumbersOrbital diagrams for any element Stereochemistry LabR/S and E/Z with guided CIP explanations Structure EditorDraw structures and export them as images

Reference

The things you look up mid-experiment, with the answer already open.

Lab TimerMultiple countdowns for complex experiments Periodic TableAll 118 elements with properties and trends Reagent GuideCommon reagents, properties and uses Safety GuideHazard codes, handling and first response

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Solubility TableInteractive solubility rules and charts

Away from the desk

Take the whole descent offline.

The Android app is the same thirty-six tools with the radio switched off. No signal in the lab, no problem — and nothing about your work leaves the handset.

Works with no signalall 36 tools run on the handset itself
Nothing uploadednotebook, data and structures stay local
Identical mathsresults match the web app exactly
Free, no adsno subscription and no locked tools

ChemEase on Android — Pick up where you left off — HomePick up where you left off

ChemEase on Android — Thirty-six, in four families — All toolsThirty-six, in four families

ChemEase on Android — Molarity to ppm in one hub — ConcentrationMolarity to ppm in one hub

ChemEase on Android — Standard, ionic and redox — BalancerStandard, ionic and redox

ChemEase on Android — Tap an IR peak, read the group — SpectroscopyTap an IR peak, read the group

ChemEase on Android — Fifty reagents, eight categories — ReagentsFifty reagents, eight categories

For departments

Nothing to procure. Nothing to collect.

No licence, no seat count, no accounts for students, and no student data leaving the device. The maths runs in the browser, which is also why it works on the lab’s older machines.

Accounts required

students open a link and start working

User data collected

the maths runs in the browser, not on a server

Tools across the syllabus

molar mass in week one to crystal field theory

Platforms, one toolbox

browser at the desk, Android in the lab

It’s already loaded.

No account, no install, no trial. Your work stays on your own device — there is nothing to sign up for and nothing to cancel.

Open the workspace