Jaconir

Free · Private · Chemistry Lab

Chemical Equation Balancer

Balance molecular, ionic, and many redox equations with exact algebraic coefficients, atom/charge checks, and live mass–mole stoichiometry — all in your browser.

Main · balancer

Balance & stoichiometry

Enter a reaction to balance

Supports polyatomic ions, hydrates, phases, and many ionic / redox forms.

Input tips

· Arrow: ->, =, or →

· Groups: Al2(SO4)3, [Cu(NH3)4]2+

· Hydrates: CuSO4·5H2O (middle dot, period, or *)

· Ions: Fe2+, SO4^2-, e-

· Phases: (s) (l) (g) (aq) at the end of a formula

A professional online equation balancer

Guess-and-check works for simple homework, but polyatomic salts, hydrates, and charged redox systems need a systematic approach. This chemical equation balancer assigns unknowns to each species and solves conservation equations with exact fractions, then reduces to the smallest whole-number coefficients. Continue into the Titration Simulator when your balanced reaction is an acid–base or redox titration.

Exact algebraic solver

BigInt fractions avoid floating-point drift so coefficients stay chemically correct even for messy redox systems.

Ions, hydrates & phases

Parse Fe2+, CuSO4·5H2O, Al2(SO4)3, and (aq)/(g)/(s)/(l) markers without losing charge or water of hydration.

Live stoichiometry

Enter grams or moles once; theoretical amounts update for every reactant and product from the mole ratio.

Atom & charge check

See a conservation table that verifies left and right counts match before you copy the answer into a lab report.

How to balance equations with this tool

  1. 1

    Type or paste the reaction

    Example: Fe2(SO4)3 + KSCN -> K3[Fe(SCN)6] + K2SO4. Use = or -> between sides.

  2. 2

    Review the balanced equation

    Coefficients appear in the smallest whole numbers. Copy the equation or a shareable link.

  3. 3

    Check atom conservation

    Confirm each element (and charge, for ionic work) matches on both sides.

  4. 4

    Run stoichiometry

    Enter a known mass or mole amount to scale yields for homework or lab prep.

Frequently asked questions

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Titration Sim

Acid–base, redox & EDTA curves with Veq and indicators.

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