NaH_2PO_4—Na_2HPO_4缓冲组份含量的测定

DETERMINATION OF THE CONMPONENT CONTENT OF A NaH_2PO_4—Na2HPO_4 BEFFER

根据Bronsted酸碱质予理论,可将NaH_2P0_4～Na_2HPO_4缓冲体系当作酸,用碱标准溶液滴定以求NaH_2PO_4含量;同理,也可将该体系当作碱,用酸标准溶液滴定以确定Na_2HPO_4含量,本文将从理论和实验证明其误差均小于±0.5％,完全满足滴定分析的要求。

Aeccrding to Bronsted's proton theory of acids and bases, a NaH_2PO_4--Na_2HPO_4 buffer may be considered as an acid and titrated with standardized base to determine its NaH_2PO_4 conted: it may also be considered as a bass and titrated with standardized acid to determine its Na_2HPO_4 content. The eror in either case is less than ±0.5%, as is proved by both theory and experiment. Such small error are well within the requirements of titration analysis.