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- Acid/base titration of vinegarWhat volume of 0.85 M NaOH (in mL) is needed to reach the equivalence point in a titration of 83.0 mL of 0.90 M HCIO4? Your Answer: Answer unitsQUESTION 15 Which of the following refers to the substance being measured in titration? O Titrant Standard solution Analyte O Indicator