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 Na₂B4O, plus 0.3124 g of unknown. After fusion at 1000°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 back-extracted into 0.1 M HCl. The final aqueous sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.42 mL of 0.01376 M EDTA. Find the weight percent of Ba in the ceramic. weight percent of Ba: wt%
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 Na₂B4O, plus 0.3124 g of unknown. After fusion at 1000°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 back-extracted into 0.1 M HCl. The final aqueous sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.42 mL of 0.01376 M EDTA. Find the weight percent of Ba in the ceramic. weight percent of Ba: wt%
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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 Na₂BO7 plus 0.3124 g of unknown. After fusion at 1000°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 CC14. After
acidification (to release the Ba²+ from its organic complex), the Ba²+ was back-extracted into 0.1 M HC1. The final aqueous
sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.42 mL of
0.01376 M EDTA. Find the weight percent of Ba in the ceramic.
weight percent of Ba:
wt%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2c93532d-a9d7-4ff4-9ece-a62b638aef17%2F063e5727-c50e-497c-86ba-333d7f1a5909%2F3p9mxid_processed.png&w=3840&q=75)
Transcribed Image Text: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 Na₂BO7 plus 0.3124 g of unknown. After fusion at 1000°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 CC14. After
acidification (to release the Ba²+ from its organic complex), the Ba²+ was back-extracted into 0.1 M HC1. The final aqueous
sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.42 mL of
0.01376 M EDTA. Find the weight percent of Ba in the ceramic.
weight percent of Ba:
wt%
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