The results of investigation of the absorption spectra of ascorbic acid solutions with varying pH value are presented. The acidity of the solutions changed with increasing concentration, with the addition of hydrogen peroxide and sodium hydroxide. It was found that the position of the maximum absorption of ascorbic acid solutions depends on the pH value. The position of the absorption maxima shifts from 243 nm to 268 nm if the pH increases from 2 to 9. The change in the spectra is due to the stronger oxidation of ascorbic acid in alkaline solutions, which is accompanied by the removal of protons.
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