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Chemistry · 2018
JEE Main 2018 · 2018-04-08 Offline · Q38
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…
An aqueous solution contains an unknown concentration of $\displaystyle \mathrm{Ba}^{2+}$. When $\displaystyle 50$ mL of a $\displaystyle 1$ M solution of $\displaystyle \mathrm{Na}_2 \mathrm{SO}_4$ is added, $\displaystyle \mathrm{BaSO}_4$ just begins to precipitate. The final volume is $\displaystyle 500$ mL. The solubility product of $\displaystyle \mathrm{BaSO}_4$ is $\displaystyle 1 \times 10^{-10}$. What is the original concentration of $\displaystyle \mathrm{Ba}^{2+}$ ?
Official answer
(3)
$\displaystyle 1.1 \times 10^{-9} \mathrm{M}$
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JEE Main 2018 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.