【Daily Question】Chemical Analysis Version 2018.12.28

2018-12-28View Original

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This post was last edited by zjp on 2018-12-28 08:08. Multiple-choice question: Which of the following situations will cause a negative error in the analysis results? () A. The reference substance Na2CO3 used for calibrating the concentration of HCl solution contains a small amount of NaHCO3 ； B. When weighing the sample using the subtraction method, worn weights were used for the first reading ； C. After heating to dissolve the standard, the solution is transferred to a volumetric flask without being cooled, diluted to the mark, mixed well, and immediately calibrated ； D. When using a pipette to transfer the sample solution, the pipette was not pre-rinsed with the solution to be transferred ； CD

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【Daily Question】Chemical Analysis Version 2018.12.28

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