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1. The mixture in the beaker should be stirred with a glass rod before filtering, and then filtered.
2. If the solution is still turbid after filtration, it should be filtered again until the solution becomes transparent. 3. How to wash the precipitate in the filter: add distilled water to the filter with a flask or a dropper to cover the water surface with the precipitate. After the solution is completely filtered out, repeat 2 to 3 times.
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