Barium titanate, a ceramic used in electronics, was analyzed by the following procedure

Chapter 0, Problem 27-20

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Barium titanate, a ceramic used in electronics, was analyzed by the following procedure: Into a Pt crucible was placed 1.2 g of Na2CO3 and 0.8 g of Na2B4O7 plus 0.314 6 g of unknown. After fusion at 1 000 C in a furnace for 30 min, the cooled solid was extracted with 50 mL of 6 M HCl, transferred to a 100-mL volumetric flask, and diluted to the mark. A 25.00-mL aliquot was treated with 5 mL of 15% tartaric acid (which complexes Ti4 and keeps it in aqueous solution) and 25 mL of ammonia buffer, pH 9.5. The solution was treated with organic reagents that complex Ba2, and the Ba complex was extracted into CCl4. After acidification (to release the Ba2 from its organic complex), the Ba2 was backextracted into 0.1 M HCl. The final aqueous sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.49 mL of 0.011 44 M EDTA. Find the weight percent of Ba in the ceramic.