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One litre of solution is removed from the supernatant of a saturated solution ofcalcium oxalate (CaC₂O₄) at 25°C and evaporated to dryness. A residue of CaC₂O₄ is produced. Calculate the mass of this residue at this temperature. (Ksp= 2.3x10⁻⁹). Please show all working and explain
(A) 6.1 g
(B) 2.9x10⁻⁷ g
(C) 3.7x10⁻⁷g
(D) 6.1x10⁻³g
(E) 1.8x10⁻¹¹g

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