Quinine in a 1.553-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 250 mL of solution. A 10.00-mL aliquot was then diluted to 50.00 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 196 on an arbitrary scale. A standard 100-ppm quinine solution registered 125 when measured under conditions identical to those for the diluted sample. Calculate the mass in milligrams of quinine in the tablet.

Question

Quinine in a 1.553-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 250 mL of solution.
A 10.00-mL aliquot was then diluted to 50.00 mL with the acid. The fluorescence intensity for the diluted
sample at 347.5 nm provided a reading of 196 on an arbitrary scale. A standard 100-ppm quinine solution
registered 125 when measured under conditions identical to those for the diluted sample. Calculate the mass
in milligrams of quinine in the tablet.

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Quantitative analysis

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