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Solubility

Quiz Number:  5
Course Name:  Chemistry
Course No.132
Quiz N0. : 5
Teacher:  Billy Cook
Teacher's Home Page:  http://faculty.icc.cc.il.us/bcook
Teacher's Email:  Bcook@icc.cc.il.us









No. of Questions=  7















     1. 

What is the solubility constant expression for Zn3(PO4)2?
        
    
        



    

    















    

    
    
        a)
        
    [Zn3+2][(PO4)2-3]
        
    




    

    
    
        b)
        
    [Zn+2][2 PO4-3]
        
    




    

    
    
        c)
        
    [Zn+2]3[PO4-3]2
        
    




    

    
    
        d)
        
    [3 Zn+2]3[2 PO4-3]2
        
    




    

    
    
        e)
        
    [Zn+3]2[PO4-2]3
        
    




    
    

    
    







    
    
        


        








     2. 

Which of the following metal sulfides is the most soluble (mol/L) in water?
        
    
        



    

    















    

    
    
        a)
        
    CoS  (Ksp = 4 x 10-21)
        
    




    

    
    
        b)
        
    CuS  (Ksp = 8 x 10-36)
        
    




    

    
    
        c)
        
    FeS  (Ksp = 5 x 10-18)
        
    




    

    
    
        d)
        
    HgS  (Ksp = 4 x 10-50)
        
    




    

    
    
        e)
        
    MnS  (Ksp = 6 x 10-16)
        
    




    
    

    
    







    
    
        


        








     3. 

The molar solubility for lead fluoride, PbF2, is 2.1 x 10-3 M at
25oC. Calculate the Ksp for lead fluoride.
        
    
        



    

    















    

    
    
        a)
        
    4.4 x 10-6
        
    




    

    
    
        b)
        
    4.2 x 10-7
        
    




    

    
    
        c)
        
    9.3 x 10-7
        
    




    

    
    
        d)
        
    3.7 x 10-8
        
    




    

    
    
        e)
        
    9.3 x 10-9
        
    




    
    

    
    







    
    
        


        








     4. 

For Cu(OH)2, Ksp = 2.6 x 10-19. What is the molar
solubility of Cu(OH)2?
        
    
        



    

    















    

    
    
        a)
        
    4.0 x 10-7 M
        
    




    

    
    
        b)
        
    64 x 10-7 M
        
    




    

    
    
        c)
        
    2.7 x 10-11 M
        
    




    

    
    
        d)
        
    5.1 x 10-10 M
        
    




    

    
    
        e)
        
    1.7 x 10-10 M
        
    




    
    

    
    







    
    
        


        










    
    
        


        








    5. 

A solution is 0.010 M in each of Pb(NO3)2,  Mn(NO3)2, 
and Zn(NO3)2.   Solid NaOH is added until the [OH-1]
of the solution is 3.0 x 10-6 M.    Ksp = 2.8 x 10-16
for Pb(OH)2,  4.5 x 10-14 for Mn(OH)2,  and 4.5
x 10-17  for Zn(OH)2.  Which one of the following
statements is true?
        
    
        



    

    















    

    
    
        a)
        
    No precipitate will form.
        
    




    

    
    
        b)
        
    Only Zn(OH)2 will precipitate.
        
    




    

    
    
        c)
        
    Only Mn(OH)2 will precipitate.
        
    




    

    
    
        d)
        
    Only Zn(OH)2 and Pb(OH)2 will precipitate.
        
    




    

    
    
        e)
        
    All three hydroxides will precipitate.
        
    




    
    

    
    







    
    
        


        








    6. 


Which of the following precipitates could be solubilized by the addition of dilute
nitric acid?



1. Ag2SO3



2. AgBr



3. AgCN


        		
    
        



    

    















    

    
    
        a)
        
    1 only
        
    




    

    
    
        b)
        
    2 only
        
    




    

    
    
        c)
        
    3 only
        
    




    

    
    
        d)
        
    1 and 2 only
        
    




    

    
    
        e)
        
    1 and 3 only
        
    




    
    

    
    










    7. 

What is the molar solubility of MgF2 in a 0.20 M Mg(NO3)2
solution?     (Ksp for MgF2 = 8.0 x 10-8.)
        
    
        



    

    















    

    
    
        a)
        
    4.0 x 10-8
        
    




    

    
    
        b)
        
    8.0 x 10-8
        
    




    

    
    
        c)
        
    3.2 x 10-4
        
    




    

    
    
        d)
        
    6.3 x 10-4
        
    




    

    
    
        e)
        
    2.7 x 10-3
        
    




    
    

    
    







    
    
        


        



















  
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