Which is a wrong statement? O a. Washing the precipitate, removes absorbed impurities O b. In homogeneous precipitation the precipitating agent is added from within the solution O. Precipitation starts by neucleation in a supersaturated solution O d. Occlusion and inclusion impurities can be removed by recrystallization

Which is a wrong statement? O a. Washing the precipitate, removes absorbed impurities O b. In homogeneous precipitation the precipitating agent is added from within the solution O. Precipitation starts by neucleation in a supersaturated solution O d. Occlusion and inclusion impurities can be removed by recrystallization

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter20: Applications Of Oxidation/reduction Titrations

Section: Chapter Questions

Problem 20.26QAP

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Why are many ionic precipitates washed with electrolyte solution instead of pure water?
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Make an schematic diagram for procedure below: B. %SO3 determination Transfer all precipitate to the filter paper avoiding any loses during the filtration procedure. One may use a rubber policeman to scrape remaining precipitate in the beaker. Wash the precipitate in the beaker 3x with hot water before transferring to the filter paper. Test the washings with 0.1 M AgNO3 Cloudiness indicates presence of chloride ions; therefore there is a need to wash more the precipitate. Carefully lift the paper out of the funnel, fold it as demonstrated by your instructor and transfer it onto the constant weighed crucible. Dry the crucible cautiously with a small flam, as instructed by your instructor. The flame should be directed at the top of the container, and the lid should be off. Avoid spattering. After drying, char the filter paper by increasing the flame temperature. The crucible should have free access to air. The lid should be kept handy to smother the filter paper in case it catches fire.…
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