The result for the latter is a non-filterable precipitate, but one in the former which filters quite well. Here is a table of common reagents useful for the preparation of ions often needed for precipitation processes. Preparation of a dry weight of your precipitate. The resulting precipitate must be heated until a stable dry state is reached. Some understanding of typical precipitate properties is mandatory for repeatable results to be achieved.
Some compounds decompose in several stages, reaching stable plateaus.
A 0.3427 g sample of bronze-age jewelry is analyzed for silver content by first dissolving it in concentrated nitric acid and precipitating it as AgCl. The precipitate is transferred to a dry sintered glass filter weighing 12.2347 g where it is separated from the filtrate and washed with dilute nitric acid. The filter and precipitate are dried at 150 o C, cooled, weighed and found to weigh 12.4373 g. Ag in the jewelry. A sample of iron ore weighing 0.4275 g is dissolved in 12M HCl.