a limestone is put into a hydrochloric acid solution
hydrochloric_acid_solution is toxic_substance. hydrocyanic_acid is acid. bluestone is limestone. hydrochloric_acid is acid. perchloric_acid is acid. hydrocyanic_acid is blood_agent. hydrochloric_acid_solution is aqueous_solution. arsenic_acid is acid. making_hydrocyanic_acid is making. chloric_acid is acid.