Question 
( 1 mathrm{M} mathrm{Na}_{2} mathrm{SO}_{4}+mathrm{Ba}^{2+} rightarrow ) Final precipitate
( 40 mathrm{mL} quad 400 mathrm{ml} )
Concenteation of ( mathrm{SO}_{4}^{2-} ) in Bat solution is
[
begin{array}{l}
M, V_{1}=M_{2} V_{2}
1 times 50=11_{2} times 500
therefore quad r 1=frac{1 times 50}{50 %}=frac{1}{10}
end{array}
]
for preeipitation we Know, Ron'sation product ( =K_{text {sp }} ) (solubility
[
begin{array}{c}
sqrt{B a^{2}+}left[delta 0_{4}^{2-}right]=operatorname{Ksp}_{10} 0 f B a S_{4}
{left[B a^{2+2 times frac{1}{10}}=10^{-10}right.}
B a^{2+}=10^{-9} M
end{array}
]
Sos Coneri of ( frac{91}{4} )
Ba in oniginal seln. fies in
( 450 mathrm{ml} ) is
[
begin{array}{l}
M_{1} V_{1}=M_{2} V_{2}
M_{1} times 450=100^{-9} times 500
M_{1}=frac{50 phi}{4 Omega} times 10^{-9}=1,11 times 10^{-9} mathrm{M}
end{array}
] 
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An aqueous solution contains an unknown concentration of Ba2+. When 50mL of a 1M solution of Na SO is added, BaSO just begins to precipitate. The final volume is 500mL. The solubility product of Baso, is 1 x 10-10. What is the original concentration of Ba2+? [JEE-MAINS.2018] (1) 5 y 10-9M 10
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