Analyze redox changes, n-factor, and equivalent weight easily. Compare initial and final oxidation states instantly. Export results, review formulas, and verify reaction behavior quickly.
This calculator tracks oxidation-state change for a selected element or species. It identifies oxidation, reduction, or no net oxidation-state change. It also estimates n-factor, total electron units, charge shift, equivalents, equivalent weight, and sample mass from your entered molar amount.
The tool is useful for classroom work, lab preparation, titration review, and fast redox checking. You can test one species at a time, compare initial and final oxidation numbers, and connect oxidation-state change with practical quantities such as moles, mass, and equivalents.
Oxidation number change: ΔON = Final oxidation number − Initial oxidation number
Absolute oxidation change: |ΔON| = absolute value of ΔON
Charge shift per formula unit: ΔCharge = ΔON × Number of changing atoms
Total charge shift for the entered coefficient: Total charge shift = ΔCharge × Stoichiometric coefficient
n-factor: n = |ΔON| × Number of changing atoms
Total electron units: Total electron units = n × Stoichiometric coefficient
Electron moles transferred: Electron moles = n × Moles of substance
Equivalents: Equivalents = n × Moles of substance
Sample mass: Mass = Moles × Molar mass
Equivalent weight: Equivalent weight = Molar mass ÷ n-factor
Interpretation: If oxidation number increases, oxidation occurs. If it decreases, reduction occurs. If it stays the same, there is no oxidation-state change for the selected species.
| Reaction step | Tracked species | Initial ON | Final ON | Changing atoms | Type | n-factor |
|---|---|---|---|---|---|---|
| Fe2+ → Fe3+ | Fe | +2 | +3 | 1 | Oxidation | 1 |
| MnO4− → Mn2+ | Mn | +7 | +2 | 1 | Reduction | 5 |
| Cr2O7^2− → Cr3+ | Cr | +6 | +3 | 2 | Reduction | 6 |
| S2− → S0 | S | −2 | 0 | 1 | Oxidation | 2 |
| Cl2 → 2Cl− | Cl | 0 | −1 | 2 | Reduction | 2 |
Oxidation and reduction always occur together in a complete reaction. This calculator focuses on one tracked species so you can measure how its oxidation number changes. The computed electron units help you connect oxidation numbers with balancing logic.
n-factor is especially useful in titration and equivalence calculations. Equivalent weight becomes important when comparing oxidants or reductants on an electron-transfer basis rather than a simple mole basis. That is why both molar and equivalent values are shown here.
It determines oxidation or reduction direction, oxidation-number change, electron transfer, n-factor, equivalents, equivalent weight, charge shift, and mass for the selected species.
Use the oxidation number of the same tracked element before and after reaction. Enter average oxidation numbers when the element exists in a compound or ion.
A rise in oxidation number means the species has effectively lost electron density. In redox accounting, that corresponds to oxidation.
n-factor is the number of electrons lost or gained per formula unit of the reactant. It links moles to equivalents.
Yes. You can enter decimal values if a compound uses an average oxidation state. The calculator will still compute the change correctly.
The result becomes “No redox change” for that selected species. n-factor, equivalent-based transfer, and electron movement become zero.
Changing atoms describe one formula unit. The coefficient scales that formula unit in the balanced reaction. Together they set total electron units.
Equivalent weight helps in redox titrations, reagent comparison, and stoichiometric planning where electron-transfer capacity matters more than only molecular mass.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.