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以苯甲酸(安息香酸)2.2—2.5克溶于3.2—3.5毫升的吡啶中(份量可按比例增减),然后用蒸馏水稀释至10毫升,滴加二滴硫酸铜试液(菲林氏溶液A)于其中,有深蓝色的沉淀生成。同上法,用水杨酸配制其与吡啶所成的水容液,滴加二滴硫酸铜试液后,出现浅蓝色的沉淀。此沉淀能溶于很多有机溶剂中;如氯仿、四氯化碳、乙醚等。吡啶苯甲酸铜沉淀与吡啶水杨酸铜沉淀相似,但
To benzoic acid (benzoic acid) 2.2-2.5 grams dissolved in 3.2-3.5 ml of pyridine (the amount can be increased or decreased in proportion), and then diluted to 10 ml with distilled water, two drops of copper sulfate test solution (Feilin solution A ) Among them, a dark blue precipitate formed. Same as the above method, salicylic acid is used to prepare its water content solution which is made of pyridine. After two drops of copper sulfate solution are added dropwise, a light blue precipitate appears. This precipitate can dissolve in many organic solvents; such as chloroform, carbon tetrachloride, ether and so on. Copper picolinate precipitates similar to copper pyridine salicylate but