Q.

Ksp(BaSO4)  is 1.1×1010 . In which case is BaSO4   precipitated?

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a

100 mL of 4×104M   of BaCl2+300mL   of  6×108M  of  Na2SO4

b

100 mL of 4×103M   of BaCl2+300mL   of 6.0×104M   of  Na2SO4

c

300mL of 4×104M  of  BaCl2+100mL  of  6.0×108M  of  Na2SO4 

d

In all cases

answer is A.

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Detailed Solution

Before mixing,  [Ba+2]=4×10−3M  ⇒[SO−24]=6×10−4M
after mixing, 
4×10−3×100=M2×400
[Br+2]=10−3M
6×10−4×300=M2×400
[SO−24]=4.5×10−4M
IP=[Ba+2][SO−24]=4.5×10−7;
Ksp<I.P.
  precipitation  is formed
 

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