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Question

If the solubility product of BaSO4 is 1.5×1010 in water. Its solubility, in moles per litre, is.

A
1.5×109
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B
3.9×105
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C
7.5×105
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D
1.2×105
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Solution

The correct option is D 1.2×105
Let S be the molar solubility of barium sulphate.
For barium sulphate;
Ksp=[Ba2+][SO24]
=S×S=S2
Molar solubility of barium sulphate, S=Ksp
=1.5×1010
=1.2×105 M

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