混合弱酸溶液缓冲容量计算  

Calculation mixture weak acid solutions buffer capacity

作　　者：方皓文 开小明 

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009 [2]桐城师范高等专科学校小学教育系,安徽桐城231400 [3]安庆师范大学安徽光电磁功能材料省级实验室,安徽安庆246011

出　　处：《安庆师范大学学报（自然科学版）》2017年第1期75-77,共3页Journal of Anqing Normal University(Natural Science Edition)

基　　金：安徽高校自然科学研究项目(KJ2016A700)

摘　　要：缓冲容量是无机化学及分析化学的重要内容之一。缓冲容量具有加和性,推导出六元酸组成溶液的缓冲容量公式,即可方便地进行广泛缓冲溶液缓冲容量的计算。通过Excel计算了0.10 mol/L乙二胺四乙酸(EDTA)溶液和0.04 mol/L伯瑞坦-罗宾森溶液,在不同pH值时的缓冲容量,给出了缓冲容量随pH的变化曲线,直观地说明了缓冲溶液的缓冲范围。结果表明,EDTA在pH<3.5,pH=6.2±1,或pH>9.3时有缓冲作用,伯瑞坦-罗宾森溶液在所有pH中都有缓冲作用。The conception of buffer solution is an important teaching contents of inorganic chemistry and analytical chemistry.The buffer capacity formula of hexahydric weak acid buffer solution is introduced.The buffer capacity has additivity,calculatation the buffer capacity of a wide buffer solution is convenient.At 0.10 moI/L EDTA buffer solution and BrittonRobinson buffer solution,the buffer capacity of various pH buffer solutions are calculated by excel.The curve of buffer capacity vs pH is graphical representation.The buffer capacity range above buffer solutions are intuitively shown.Graphical representation shows that EDTA buffer solutions have very good buffer action at pH〈3.5,pH=6.2±1 and pH〉9.3.BrittonRobinson buffer solution has very wide buffer action

关 键 词：缓冲溶液 缓冲容量 EDTA 伯瑞坦-罗宾森 加和性 

分 类 号：O651[理学—分析化学]