Answer: Filtration
Explanation: Vacuum filtration, in which the liquid is driven through the filter paper by a vacuum and the solid is left above the paper, is the best method for separating out a precipitate. After carefully cleaning the flask and washing the precipitate with water, quickly wash with ethanol to aid in dying. The precipitate needs to be prepared to be scraped off after some time on the vacuum pump.
To get rid of the (soluble) sodium nitrate residue, we would try to gather the yellow precipitate on a frit and give it a thorough wash with FRESH quantities of water.
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