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An aqueous solution contains an unknown concentration of Ba 2+ . When 50 mL of a 1 M solution of Na 2 SO 4 is added, BaSO 4 just begins to precipitate. The final volume is 500 mL. The solubility product of BaSO 4 is 1 × 10 –10 . What is the original concentration of Ba 2+ ?

1. 5 × 10 –9 M
2. 2 × 10 –9 M
3. 1.1 × 10 –9 M
4. 1.0 × 10 –10 M Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : Ionic Equilibrium, Ex #4, Page 50, Q. No. 9 ] CAREER POINT CAREER POINT , CP Tower, IPIA, Road No.1, Kota (Raj.), : 0744-6630500 | www.ecareerpoint.com Email: info@cpil.in Page # 28 [CODE – A]

Correct answer: 1.1 × 10 –9 M

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