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Updated: May 18, 2025
Inaccurate values should not be erased or discarded. They should be retained and marked "correct" or "incorrect," as indicated by the final outcome of the titrations. This custom should be rigidly followed in all analytical work. In a few cases a larger variation is permissible, but these are rare and can only be recognized by an experienced analyst.
Solutions of the latter strength yield more accurate results when small percentages of acid or alkali are to be determined. These substances employed as indicators are usually organic compounds of complex structure and are closely allied to the dyestuffs in character. The indicators in most common use for acid and alkali titrations are methyl orange, litmus, and phenolphthalein.
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