a mixture of 0.2m barium chloride and 0.2m sodium sulfate produced a precipitate and supernatant liquid that were separated by gravimetric filtration. the mass of the solid was determined. prior to filtration, a watch glass and filter paper weighed 35.671g. after filtration and drying, the obtained solid product, the watch glass and the filter paper weighed 35.969g. the mass of the precipitate (now residue) was found to be what



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