【Daily Question】Chemical Analysis Edition, 11.4.2021
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The NaOH standard solution containing Na2CO3 is calibrated using methyl orange as an indicator. When this standard solution is used to titrate a certain acid with phenolphthalein as an indicator, the measured value will be A. too high B. too low C. unchanged D. cannot be determined A
A: It contains sodium carbonate, and when it’s made slightly alkaline, a few more drops are added; P