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how do I figure out the molecular formula for The concentration of lead (II) ions in a sample of polluted water that also contains nitrate ions is determined by adding solid sodium sulfate.

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    You don't have a question as much as a statement. No data, no numbers.
    Adding Na2SO4 to a sample of water containing Pb^+2 will ppt PbSO4. You measure the amount of water, ppt PbSO4, filter, dry, weigh the dry PbSO4 collected, then mass Pb = mass PbSO4 x (molar mass Pb/molar mass PbSO4).
    Finally %Pb = (mass Pb/mass sample)*100 = ??

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