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By using a spectrophotometer set at 400 nm, an absorbance reading of 0.050 was obtained for a solution of p-nitrophenol at pH 6.5. The molar extinction coefficient of the p-nitrophenol 21500 M-1cm-1 and the pka for p-nitrophenol is 7. Determine the total concentration of p-nitrophenol in the experimental solution.

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