Estimation of Barium Sulfate (BaSO₄) by Gravimetric Analysis involves precipitating Ba²⁺ as BaSO₄, filtering, drying, and weighing the insoluble precipitate to determine barium content.
Steps for Estimation of Barium Sulfate (BaSO₄) by Gravimetric Analysis:
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Sample Preparation:
- Weigh the sample containing barium ions (Ba²⁺) and dissolve in distilled water or dilute HCl.
- Filter the solution to remove insoluble impurities.
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Precipitation:
- Add sodium sulfate (Na₂SO₄) to the solution.
- Barium ions react with sulfate ions to form barium sulfate precipitate:
- Ba2+(aq) + SO42−(aq) → BaSO4(s)
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Digestion:
- Let the precipitate settle, and optionally heat the solution to improve the precipitate’s purity and particle size.
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Filtration:
- Filter the precipitate using suitable filter paper or apparatus.
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Washing and Drying:
- Wash the precipitate with distilled water to remove contaminants.
- Transfer the precipitate to a pre-weighed crucible and dry in an oven or desiccator.
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Weighing:
- Weigh the dried precipitate and subtract the weight of the empty crucible to obtain the mass of BaSO₄.
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Calculation:
- Calculate the percentage of barium using:
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Ba = ((Mass of BaSO₄ × Molar mass of Ba) / (Weight of sample × Molar mass of BaSO₄)) × 100
- This streamlined process ensures accurate determination of barium in the sample via gravimetric analysis.
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