915 ml of gas bubbled through 25 ml of ammoniacal silver nitrate reagent to which has been added 3 ml of ammonia must not cause clouding or blackening of this solution
Le barbotage de 915 ml de gaz à travers 25 ml de réactif au nitrate d'argent ammoniacal additionnés de 3 ml d'ammoniaque ne doit provoquer ni trouble ni noircissement de cette solution