Question

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl?

Fe2O3 + HCl → FeCl3 + H2O
Fe2O3 +3 HCl → 2 FeCl3 + H2O
Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O
Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O

Answer 1

4th option i.e Fe2O3+3HCL—>2FeCl3+3H2O

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Answer 2

Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O correctly balances the equation.

• The rust is oxidation of iron with the oxygen and moisture present in atmosphere. This leads degradation of the quality of iron product decreasing its concentration as well.
• Addition of hydrochloric acid causes reaction yielding product iron chloride.
• Excess of acid can also dissolve the metal with rust, as it will react with any iron particles available.