【Daily Question】Chemical Analysis Edition 2020.1.7
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This post was last edited by zjp on 2020-1-7 at 08:53. Multiple-choice question: The pre-treatment method for the reference substance NaCl before use is ( ), after which it is placed in a desiccator to cool to room temperature. A. Dry at 140–150°C until a constant weight is reached. B. Burn at 270–300°C until a constant weight is reached. C. Dry at 105–110°C until a constant weight is reached. D. Burn at 500–600°C until a constant weight is reached. D
D. Burn at 500–600°C until a constant weight is reached