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将含NO_3~-的溶液注入试管,加少量稀硫酸酸化后再加少量含Fe~(2+)的水溶液,振荡,然后沿管壁缓缓注入浓硫酸,由于浓硫酸密度较大,
The solution containing NO_3~- is injected into a test tube, acidified with a small amount of dilute sulfuric acid, and then a small amount of aqueous solution containing Fe~(2+) is added and shaken. Concentrated sulfuric acid is then slowly injected along the tube wall. Due to the high density of concentrated sulfuric acid,