3. A weighing of 0.9850 g of a mixture of barium and calcium nitrates is dissolved in a 200 ml volumetric flask. The volume of the analyzed solution taken for titration is 20 mm. When titrated with a chromogen, 18.00 ml of 0.05 N Trilon B is consumed, and when titrated with murexide, 10.15 ml is consumed. Determine the percentage of barium and calcium in the mixture.

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