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【Daily Question】Chemical Analysis Version 2019.1.22

2019-01-22View Original

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This post was last edited by zjp on 2019-1-22 08:32. Multiple-choice question: When preparing a Na2S2O3 standard solution, it is necessary to use freshly boiled and cooled distilled water along with a small amount of Na2CO3. What is the purpose of this? A. Prevent the oxidation of Na2S2O3 B. Increase the solubility of Na2S2O3 C. Remove CO2 D. Facilitate filtration E. Kill microorganisms   CE

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