[Magical]

 To a 1.00 litre solution of 0.01M Pb(NO₃)^2- was added 20.0 mmols of Na₂SO₄.
Determine the relative loss of Pb²⁺ from solution owing to precipitation of PbSO₄.

Thank you in advance

[Borek]

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This question calls for a use of solubility product.