返滴定法确定混合碱第一计量点的探讨

Determination of the first equivalence point of the mixed bases by back titrimetric method

采用滴定剂HCl稍过量 ,NaOH标准溶液返滴定过量HCl的方法 ,较准确地确定混合碱第一计量点 .并通过分光光度测定 ,对该法进行了对比验证 .通过实际样品测定 ,滴定误差均在 0 5 %以下 .

A back titrimetric method was used to accurately determine the first measurement point of the mixed bases.In the method,a standard solution of sodium hydroxide was used to titrate the little excess standard hydrochloric acid.The contrast experiment was studied by spectrophotometry.Experimental results of the determination for real samples showed that the titration error was less than 0.5%.