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Question

[Ba2+] when CaSO4 starts just precipitation will be:

A
[Ba2+]=4.58×107M
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B
[Ba2+]=5.58×107M
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C
[Ba2+]=4.85×107M
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D
None of these
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Solution

The correct option is A [Ba2+]=4.58×107M
Ksp for CaSO4 :

Ksp(CaSO4)=[Ca2+][SO24]
2.4×105=0.1×[SO24]
[SO24]=2.4×104M
Ksp(BaSO4)=[Ba2+][SO24]
1.1×1010=[Ba2+]×2.4×104
[Ba2+]=4.58×107M

Hence,option A is correct.

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