Aqueous hydrochloric acid reacts with solid manganese(iv) oxide to form aqueous manganese(ii) chloride, liquid water and chlorine gas.

The balanced chemical equation for the reaction is

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Aqueous hydrochloric acid reacts with solid manganese (iv) oxide to form aqueous manganese(ii) chloride, liquid water and chlorine gas.

The equation for the reaction can be written as follow:

Hydrochloric acid => HCl

Manganese (iv) oxide => MnO₂

Manganese (ii) chloride => MnCl₂

Water => H₂O

Chlorine gas => Cl₂

Hydrochloric acid  + Manganese (iv) oxide —> Manganese (ii) chloride + Water + Chlorine gas

The above equation can be balance as follow:

HCl + MnO₂ → MnCl₂ + H₂O + Cl₂

There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before H₂O as shown below:

HCl + MnO₂ → MnCl₂ + 2H₂O + Cl₂

There are 4 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 4 before HCl as shown below:

4HCl(aq) + MnO₂(s) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g)

Now, the equation is balanced.

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