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【Daily Question】Chemical Analysis Edition, 10.9.2021

2021-10-09View Original

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The label concentration of the NaOH solution is 0.300 mol/L. This solution has absorbed a small amount of CO2 from the air. Now, using phenolphthalein as an indicator, it is calibrated with standard HCl solution, and the calibration result is compared to the label concentration. A. Higher; B. Lower; C. Unchanged; D. Unable to determine. B

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