5. Write solubility product expressions for the following compounds. a.) K 2 CrO

Question

5.         Write solubility product expressions for the following compounds.

a.)        K2CrO4                                                b.)        Ca3(PO4)2

c.)        Ca(OH)2                                              d.)        MgCrO4

6.         Write the equilibrium equations on which the following Ksp expressions are based:

            a)         [Hg22+][Cl-]2                                      b)         [Al3+]2[S2-]3

7.         The solubility of an unknown compound, AB2, in water at

            25.0oC is 2.25x10-4 mole/L. Calculate Ksp.

Explanation / Answer

a.)        K2CrO4     

           K2CrO4 --------> 2K+ + CrO42-

          Ksp   = [K+]2[CrO42-]

b.   Ca3(PO4)2

     Ca3(PO4)2 ----------> 3Ca+2 + 2PO43-

     Ksp    = [Ca+2]3[PO43-]2

c. Ca(OH)2     

    Ca(OH)2     -------> Ca+2 + 2OH-

      Ksp = [Ca+2][OH-]2

d.   MgCrO4

    MgCrO4 --------> Mg+2 + CrO42-

     Ksp =[ Mg+2 ] [CrO42-]

6.

a)         [Hg22+][Cl-]2    

         Hg2Cl2 --------> Hg22+ + 2Cl-

b. [Al3+]2[S2-]3

    Al2S3 --------> 2Al+3 + 3S-2

7.

AB2   --------> A+2 +2 B-

                    s        2s

Ksp   = [A+2]{B-]2

Ksp   = s(2s)2

          = 4s3

         = 4(2.25*10-4)2

          = 2.025*10-7

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