钴(Ⅱ)盐鉴别可溶性碳酸盐溶液实验的设计与研究

Identifying Soluble Carbonate Solution by Cobalt (Ⅱ) Salt

为拓展钴(Ⅱ)盐的用途,利用钴(Ⅱ)盐在碱液中的多样性和可溶性碳酸盐溶液组分含量的差异性,采用分别向2种无色可溶性碳酸盐溶液中滴加钴盐溶液的措施,建立了钴(Ⅱ)盐鉴别碳酸钠溶液和碳酸氢钠溶液的有效方法。实验结果表明,反应后碳酸钠溶液呈清晰的蓝色浑浊或沉淀,而碳酸氢钠溶液则呈清晰的紫红色浑浊或沉淀。该方法现象明显、安全可靠、重现性好、成功率高、适用性强、应用面广,可应用于食品、药品检测,食品质量与安全,医药健康,化学化工等技术领域,也可用作课堂演示实验。

In order to expand the use of cobalt salt(Ⅱ),based on the diversity of salt(Ⅱ)in alkali solution and the difference in the content of soluble carbonate solution,an effective method was established to fast,conveniently and effectively identify sodium carbonate solution and sodium bicarbonate solution by cobalt(Ⅱ)salt.The experimental results showed that after the reaction,the sodium carbonate solution showed clear blue turbidity or precipitation,while the sodium bicarbonate solution presented clear purplish red turbidity or precipitation.This method possesses the following advantages:obvious experimental phenomenon,safety and reliability,good reproducibility,high success rate,strong applicability,wide application.It can be applied to food and drug testing,food quality and safety,medicine and health,chemistry and chemical industry and other technical fields,and can also be used as a classroom demonstration experiment.