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It is not quite correct of the statement that "ascorbic acid cannot be determined by Beer Lambert's law, because it does not absorb visible light." Although the second part of the statement is true, the highlighted part is incorrect since Beer Lambert's law applies for ultra-violet range of the spectrum. According to Ref.1, ascorbic acid (Vitamin C)...

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Ascorbic acid cannot be determined by Beer Lambert's law, because it does not absorb visible light. The best way is to perform a redox titration with iodine. Usually a citrus fruit is $45-50$ mg ascorbic acid in $100$ g juice. But you should know that there is also $3840 - 6080$ mg citric acid in $100$ g juice. Ref.: Konrsd Diem, Scientific Tables, CIBA-...

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Assuming we started from a initial volume $V_i$ of about 100 ml, some considerations must be made: at the end of the titration, the final volume, following the addition of the titrant reagent, will be more than 100 ml. Remembering that conductivity decreases linearly with dilution, the value provided by the instrument is influenced by the effect of dilution. ...

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