when 38.0 ml of 0.1250 m h2so4 is added to 100. ml of a solution of pb(no3)2, a precipitate of pbso4 forms. the pbso4 is then filtered from the solution, dried, and weighed. if the recovered pbso4 is found to have a mass of 0.0471 g, what was the concentration of nitrate ions in the original solution?

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