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(d) A 3.0 cm unknown sample of quinine yielded a fluorescence of 110. Following addition of 0.5 cm of 5 ppm quinine, the fluorescence was

(d) A 3.0 cm unknown sample of quinine yielded a fluorescence of 110. Following addition of 0.5 cm of 5 ppm quinine, the fluorescence was found to be 120. Calculate the concentration of the unknown quinine solution. [10 marks]

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