Problem: Given that the solubility of Co3(PO4)2 is 4.5 x 10-8 mo/L what is its Ksp value?

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We’re being asked to determine the Ksp value given that the solubility of Co3(PO4)2 is 4.5 x 10-8 mo/L 


Recall that Ksp is an equilibrium constant related to slightly soluble ionic compounds. 


The dissociation of Co3(PO4)2 in solution is as follows:

Co3(PO4)2(s) ⇌ 3 Co2+(aq) + 2 PO43-(aq) 


We can construct an ICE table for this dissociation. 

Remember that solids are ignored in the ICE table and Ksp expression.


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Given that the solubility of Co3(PO4)2 is 4.5 x 10-8 mo/L what is its Ksp value?

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