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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.
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