沉淀重量法测定氯化钡中钡含量微型化学实验研究

氯化钡中钡含量的测定实验是师范院校化学专业分析化学实验的重要内容之一,按教材进行实验(BaSO4重量法)至少要10小时才能完成,并且耗能较大,因此本文在文献1]常规法的基础上,对该实验测定方法作了新的改进,用BaCrO4法取代BaSO4法,并将试样的用量缩小5倍,10倍进行了微型法试验,其分析结果的准确度与精密度都获得了满意的结果,本微型法与常规法相比,具有试剂用量少,仪器简单,操作方便、速度快、及节省实验经费等特点。

The Microscale Chemistry Experiment Study on the Measuring the Bacuim in Bacuim Chlorid with Deposition Gravimetric Methods

The measurement of the bacuim in bacuim chlorid is an important part of analytical chemistry experiments according to the chemistry curricula in teachers college.Traditionarily,the determination(Gravimetric methods for it is used) is accomplished in at least 10 hours,and too much power is needed in the process.Therefore,on the basis of the literature~(1]),this measuring method is improved in this paper.Barium chromate is used instead of bacuim sulphate,and the amounts of all the reagents are decreased by 5-10 times.The analytic result of the microscale experiment is satisfying with good accuracy and excellent reproductivity.Compared with the routine determination,the minitype is operated more easily and finished quicklier with less reagent,simpler experimental apparatus and less cost.