Chlorine gas can be produced in the lab by the reaction is K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ +7H₂O + 3Cl₂.
Chlorine gas is produced in many ways in laboratory. One of the ways is from potassium chromium oxide with hydrochloric acid.
The result is potassium chloride and chromium chloride and water and three molecules of chlorine.
Thus, the reaction is K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ +7H₂O + 3Cl₂.
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