Tag Archives: precipitate

Vacuum Filtration

Illustration showing the equipment for filtering a precipitate through a filtering crucible. Suction from a vacuum, often from a water aspirator, pulls the solution through the filtering crucible leaving the precipitate behind. The trap prevents water from an aspirator from … Continue reading

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Gravity Filtration

Illustration showing how to prepare a filter paper cone for gravity filtration. The filter paper circle in (a) is folded in half (b), and folded in half again (c). The folded filter paper is parted (d) and a small corner … Continue reading

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Coagulation of a Precipitate

Two methods for coagulating a precipitate of AgCl are illustrated here: (a) because of electrostatic repulsion, coagulation will not take place if  both particles are positively charged; (b) decreasing the charge within the primary adsorption layer, by adding additional NaCl, … Continue reading

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Inclusions in Precipitates of Potassium Perchlorate

Mixing solutions of 1.5 M KNO3 and 1.5 M HClO4 produces a white precipitate of KClO4. If permanganate ions, MnO4–, are present, an inclusion of KMnO4 is possible. Impure precipitates of KClO4 are purple if an inclusion of KMnO4 is … Continue reading

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Inclusions, Occlusions, and Surface Adsorbates

Three examples of impurities that may form during precipitation. The cubic frame represents the precipitate and the blue marks are impurities: (a) inclusions, (b) occlusions, and (c) surface adsorbates. Inclusions are randomly distributed throughout the precipitate. Occlusions are localized within … Continue reading

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