A) \[72\,{{s}^{5}}\]
B) \[108\,{{s}^{5}}\]
C) \[9\,{{s}^{2}}\]
D) \[8\,{{s}^{3}}\]
Correct Answer: B
Solution :
The solubility of \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] is s mol/L. It ionises as \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}3C{{a}^{2+}}+2PO_{4}^{3-}\] \[{{K}_{sp}}={{[C{{a}^{2+}}]}^{3}}\,{{[PO_{4}^{3-}]}^{2}}\] \[={{(3\,s)}^{3}}\,{{(2\,s)}^{2}}\] \[=27\,{{s}^{3}}\times 4{{s}^{2}}\] \[{{K}_{sp}}=108\,{{s}^{5}}\]
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