Table of contents

This is an oxidation-reduction (redox) reaction:

2 Cl0 + 2 e- → 2 Cl-I (reduction)

2 Ba0 - 2 e- → 2 BaI (oxidation)

Cl2 is an oxidizing agent, Ba is a reducing agent.

Input interpretation

Ba + Cl2 → BaCl2

Barium chlorine barium chlorine

Balanced equation

Balance the chemical equation algebraically:

Ba + Cl2 → BaCl2

Add stoichiometric coefficients, c, to the reactants and products:

C1 Ba + C2 Cl2 → C3 BaCl2

Set the number of atoms in the reactants equal to the number of atoms in the products for Ba and Cl:

Ba: C1=C3

Cl: 2c2=C3

Since the coefficients are relative quantities and underdetermined, choose a coefficient to set arbitrarily. To keep the coefficients small, the arbitrary value is ordinarily one. For instance, set c2 = 1 and solve the system of equations for the remaining coefficients:

c1=2 C2=1

C3 = 2

Substitute the coefficients into the chemical reaction to obtain the balanced equation:


Ba + Cl2 → BaCl2