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The experiment aimed to determine the pKa of phenol red using spectrophotometric analysis, measuring absorbance across a range of pH levels. The maximum absorbance wavelengths were identified at 430 nm for the acidic form and 560 nm for the basic form, with pKa values calculated as 8.413 and 8.732, yielding an average of 8.572. The results confirmed the reliability of spectrophotometric methods for determining pKa and demonstrated phenol red

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patelheli3108

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EN