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This represents a double displacement reaction between aqueous solutions of sodium sulfate (Na2SO4) and lead(II) nitrate (Pb(NO3)2). The reaction produces a white precipitate of lead(II) sulfate (PbSO4) and an aqueous solution of sodium nitrate (NaNO3). The balanced chemical equation is:
Na2SO4(aq) + Pb(NO3)2(aq) → PbSO4(s) + 2NaNO3(aq)