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User Manual & Capabilities

Everything runs on your device — no internet needed. Jump to Manual or Capabilities.

Manual

1. Predict a reaction (reactants only)

  1. Type the reactants

    Enter the starting substances in the Reactants box, separated by +. Leave the Products box empty.

    KMnO4 + HCl

  2. Add conditions (optional)

    Type conditions such as heat, cold, catalyst, Pt, light, acidic, basic, excess, dilute or concentrated. They change which pathway is chosen.

    NH3 + O2 · conditions: Pt, heat

  3. Press Complete & Balance

    The app predicts products from its built-in rules, balances the equation and shows the status, rule used and an explanation.

2. Balance an equation you already know

  1. Fill both sides

    Type reactants and products, then press Balance equation. Any correct equation balances exactly — atoms and charge are both checked.

    C3H8 + O2 → CO2 + H2O

  2. Paste a whole equation

    You can paste the full equation into the Reactants box with =, -> or →. The app splits it for you. A stray = at the end is ignored.

    KBrO3 + 5KBr + 6HCl=

  3. Short redox equations

    Enter just the main redox species and pick the Redox medium (Auto / Acidic / Basic). H⁺, OH⁻ and water are added for you.

    MnO4- + Fe2+ → Mn2+ + Fe3+

3. How to type formulas

  1. Numbers become subscripts

    H2SO4 shows as H₂SO₄. A number at the start is a coefficient (2H2O).

  2. Ions and charges

    Write Fe3+, Cl-, SO4^2- or SO4 2-. Bracketed complexes work too.

    [Fe(CN)6]4- · K3[Co(NO2)6]

  3. Hydrates and double salts

    Use a dot.

    CuSO4.5H2O · CuSO4.Cu(OH)2

  4. Condensed organic notation

    Structural forms are understood.

    CH3-COOH · COONH4-COONH4

  5. Typing mistakes

    If something looks wrong (Ci instead of Cl, 0 instead of O, (CH3COOH)2Pb instead of Pb(CH3COO)2) you get a 'Did you mean…?' banner. Nothing changes unless you click the suggestion.

4. Reading the result

  1. Confirmed

    A specific built-in rule applies and the equation passed every check.

  2. Multiple possibilities

    More than one known pathway fits. The app shows them and tells you which condition or ratio decides.

  3. Partially supported

    The reaction type is recognised but the exact products need more information.

  4. Unsupported

    No reliable rule exists. The app says so instead of guessing — enter the products yourself and it will balance them.

  5. Checks and breakdown

    ✓ Balanced · ✓ Atoms conserved · ✓ Charge conserved. Redox reactions also show oxidation numbers, both half-reactions and electron matching step by step.

5. Other tools on the main page

  1. Stoichiometry table

    Enter a mass or moles for one substance; the app finds the limiting reagent and every other amount.

  2. Periodic table

    Tap any of the 118 elements to see its data or insert it into your formula.

  3. Electrochemistry

    Choose two half-cells to get E°cell, ΔG° and Nernst potentials.

  4. Kinetics

    Rate laws, half-life, integrated rate equations and Arrhenius calculations.

  5. Saved reactions

    When the app can't predict something, you can enter the answer and save it on this device. It is reused only after the built-in rules fail and is always re-checked.

  6. Works offline

    Everything runs on your device. Install it from your browser menu and it works with Wi-Fi off.

Capabilities

26 supported areas, each built from general rules (one rule covers a whole family of reactions, not single equations).

Fully supported Rule-based prediction Partial / conditions needed Not supported

Balancing & input

Any given equation

Fully supported

Exact whole-number balancing of every element and total charge. Molecular, ionic, complexes, hydrates, electrons.

Fe2O3 + CO → Fe + CO2Cr2O7^2- + Fe2+ + H+ → Cr3+ + Fe3+ + H2O

Ion-electron (half-reaction) method

Fully supported

Skeletal redox in acidic or basic medium with step-by-step display.

MnO4- + C2O4^2- → Mn2+ + CO2

Formula reading

Fully supported

Subscripts, charges (Fe3+, SO4 2-, SO4^2-), brackets, hydrates, condensed organic notation, typo hints.

COONH4-COONH4Na3[Co(NO2)6]

Stoichiometry

Fully supported

Moles, masses, limiting reagent, theoretical yield using the 118-element table.

2H2 + O2 → 2H2O with 4 g H2

Inorganic prediction

Combustion & synthesis

Rule-based prediction

Hydrocarbons and organics with O2; element + element; metal + oxygen.

C3H8 + O2Fe + O2H2 + O2

Decomposition

Rule-based prediction

Carbonates, hydroxides, chlorates, nitrates and other known classes on heating.

CaCO3 (heat)KClO3 (heat)

Single displacement

Rule-based prediction

Metal activity series and halogen activity.

Zn + CuSO4Cl2 + KBr

Double displacement & precipitation

Rule-based prediction

Salt + salt, ion + ion and ion + salt, using a built-in solubility table.

NaCl + AgNO3Cl- + AgNO3SO4 2- + Pb(CH3COO)2Ca2+ + (NH4)2C2O4

Acid–base

Rule-based prediction

Neutralisation, weak acid/base equilibria (⇌), ammonium salts or free NH4+ with bases.

H3O+ + OH-NH4+ + NaOHCH3COOH + H2O

Gas evolution

Rule-based prediction

Acids with carbonates, sulfites, sulfides, thiosulfates.

Na2S2O3 + HClCaCO3 + HCl

Oxides

Rule-based prediction

Acidic, basic and amphoteric oxides with water, acids and bases; ratio-dependent products flagged.

CO2 + NaOHZnO + NaOHP2O5 + NaOHSiO2 + NaOH

Peroxides

Rule-based prediction

Peroxides with acids give hydrogen peroxide.

Na2O2 + H2SO4

Redox

Oxidising agents with acid

Rule-based prediction

Permanganate, dichromate, MnO2 and others reduced by halide acids.

KMnO4 + HClK2Cr2O7 + HCl

Comproportionation

Rule-based prediction

Two oxidation states of one element meet in the middle.

KBrO3 + KBr + HClKIO3 + KI + H2SO4H2S + SO2

Disproportionation

Rule-based prediction

Halogens in cold or hot alkali, phosphorus and others from oxidation-state ladders.

Cl2 + NaOHCl2 + H2OP4 + NaOH + H2O

Condition-dependent oxidation

Partial / conditions needed

Shows every known pathway and what decides it.

NH3 + O2Cu + HNO3

Qualitative analysis & complexes

Cation tests

Rule-based prediction

Cobaltinitrite (K⁺, NH₄⁺), pyroantimonate (Na⁺), tetraphenylborate, chloroplatinate, oxalate (Ca²⁺, Sr²⁺).

KCl + Na3[Co(NO2)6]Na+ + K2H2Sb2O7Ca2+ + COONH4-COONH4

Anion tests

Rule-based prediction

Halides with silver or lead salts, sulfate with lead or barium salts.

Cl- + AgNO3SO4 2- + Pb(CH3COO)2

Iron tests

Rule-based prediction

Prussian blue, Turnbull's blue, blood-red thiocyanate complex.

FeCl3 + K4[Fe(CN)6]Fe3+ + NH4SCN + 5H2O

Ammonia tests

Rule-based prediction

Nessler's reagent (needs a hydroxide) and NH₃ release with bases.

K2HgI4 + NH3 + KOHK2HgI4 + NH4Cl + NaOH

Ammine complexes

Rule-based prediction

Copper(II) salts, hydroxide and basic salts dissolving in ammonia.

CuSO4.Cu(OH)2 + (NH4)2SO4 + NH4OHCu(OH)2 + NH3

Coordination chemistry

Partial / conditions needed

Reads ligands, coordination number, complex charge and metal oxidation state; ligand substitution only for known classes.

[Co(NH3)6]Cl3

Organic & other

Esters

Rule-based prediction

Esterification (⇌), acid hydrolysis, saponification.

CH3COOH + C2H5OHCH3COOC2H5 + NaOH

Simple organic classes

Partial / conditions needed

Hydrogenation, hydration, dehydration, alcohol oxidation, radical halogenation; stereo labels preserved.

C2H4 + H2CH4 + Cl2 (light)

Electrochemistry

Fully supported

Built-in standard potentials, E°cell, ΔG°, Nernst equation.

Zn | Zn2+ || Cu2+ | Cu

Kinetics

Fully supported

Rate laws, orders, half-life, Arrhenius.

k at two temperatures

Not supported (honestly reported)

Complex organic synthesis

Not supported

Multi-step mechanisms, named reactions and large biomolecules are not predicted — but they still balance if you enter the products.

Reactions outside the rules

Not supported

The app answers 'Unsupported' rather than inventing products. Save your own answer to teach it on this device.

NaClO3 + NaCl + HCl