碳酸钠中纯度检测方案(自动电位滴定)

KGM KYOTO ELECTRONICSMANUFACTURING CO.，LTD.TIQ-99329enL-KM KYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application MemoPurity of Sodium Carbonate 1.Overview Purity of Sodium carbonate is determined according to JIS K 8625-2017 Sodium carbonateand ISO 6353-2： 1983 Reagents for chemical analysis-Part2 ： Specifications --First series. Theheat dried test sample is diluted with pure water， and titrated with 1mol/L hydrochloric acid upto the second endpoint passing EP1. The purity of sodium carbonate is calculated from thetitration volume. The second endpoint is the second inflexion on the titration curve. Na2CO3 HCI →NaHCO： NaCl (Reaction formula at EP1) NaHCOs HC1 →H2CO3 NaCl (Reaction formula at EP2) Na2CO： 2HCl→HCO： + 2NaCl (Overall reaction formula) 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier： STD) Electrode Combined glass electrode Temperature compensation electrode 3. Reagents 4. Example Sample Titration up Sodium to EP2 carbonate (g) (mL) (%) 1 1.2898 24.3092 99.462 2 1.2742 24.0696 99.688 3 1.2900 24.2882 99.361 Average 99.504 SD 0.167 RSD(%) 0.168 Please feel free to contact us for any further information. Kyoto Electronics Manufacturing Co.， Ltd. Overseas Sales & Marketing Sect. 京都电子工业株式会社-可睦电子(上海)商贸有限公司 上海市徐汇区宜山路333号1201室 电话：021-54488867 电邮： kemu-kem@163.com 网址： http：//www.kem-china.com 碳酸钠纯度的测定 应用资料(英文版)碳酸钠的纯度根据GB/T 639化学试剂 碳酸钠和ISO 6353-2标准方法。将加热干燥的试样用纯水稀释，用1mol/L盐酸滴定至第二个终点。碳酸钠的纯度由滴定体积计算。第二个终点是滴定曲线上的第二个拐点。