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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=  5

















    
    
        


        








     1. 

The [OH-1] of a saturated solution Mg(OH)2 is 2.9 x 10-4
M. What is the Ksp for Mg(OH)2?
        
    
        



    

    















    

    
    
        a)
        
    6.1 x 10-12
        
    




    

    
    
        b)
        
    1.2 x 10-11
        
    




    

    
    
        c)
        
    2.4 x 10-11
        
    




    

    
    
        d)
        
    9.8 x 10-11
        
    




    

    
    
        e)
        
    none of these
        
    




    
    

    
    







    
    
        


        









    2. 

From a consideration of the reactions


 



Ag+1(aq)  +  2  NH3(aq) dblaro.jpg (896 bytes) Ag(NH3)2+1(aq)
            K = 1.8 x 107



Ag+1(aq)  +  Cl-1(aq)
dblaro.jpg (896 bytes)AgCl(s)
              
                 K
= 5.6 x 109



 



calculate the equilibrium constant for



AgCl(s)  +  2 NH3(aq) dblaro.jpg (896 bytes) Ag(NH3)2+1(aq)
  +  Cl-1(aq)
        

    
        



    

    















    

    
    
        a)
        
    1.0 x 10-17
        
    




    

    
    
        b)
        
    3.2 x 10-3
        
    




    

    
    
        c)
        
    1.0 x 1017
        
    




    

    
    
        d)
        
    1.0 x 103
        
    




    

    
    
        e)
        
    3.1 x 1016
        
    




    
    

    
    







    
    
        


        








    3. 

The following equilibrium


 



Ag+1(aq)  +  Fe+2(aq)dblaro.jpg (896 bytes) Fe+3(aq)  +  Ag(s)



 



was established by combining equal volumes of 0.10 M AgNO3(aq) and 0.10 M
Fe(NO3)2(aq). Which one of the following will shift the equilibrium
to the right?



 



    1. Adding 0.10 M AgNO3(aq).



    2. Removing some Ag(s) by filtering the mixture.



    3. Decreasing the Fe+3 concentration by another
chemical reaction.
        

    
        



    

    















    

    
    
        a)
        
    1 only
        
    




    

    
    
        b)
        
    2 only
        
    




    

    
    
        c)
        
    3 only
        
    




    

    
    
        d)
        
    1 and 2 only
        
    




    

    
    
        e)
        
    1 and 3 only
        
    




    
    

    
    







    
    
        


        








    4. 

What is the value of the dissociation constant, Kd, for the complex ion
Ni(NH3)6+2?     (Kf for
Ni(NH3)6+2 = 5.6 x 108)
        
    
        



    

    















    

    
    
        a)
        
    2.8 x 101
        
    




    

    
    
        b)
        
    5.6 x 10-8
        
    




    

    
    
        c)
        
    3.5 x 10-2
        
    




    

    
    
        d)
        
    3.1 x 1017
        
    




    

    
    
        e)
        
    1.8 x 10-9
        
    




    
    

    
    







    
    
        


        








    5. 

What is the concentration of the Cd+2(aq) ion in a 0.010 M Cd(NO3)2
solution that is also 1.0 M NH3?     (Kf  for
Cd(NH3)4+2  =  1.0 x 107
        
    
        



    

    















    

    
    
        a)
        
    5.6 x 10-3
        
    




    

    
    
        b)
        
    1.0 x 10-9
        
    




    

    
    
        c)
        
    7.2 x 10-12
        
    




    

    
    
        d)
        
    1.0 x 10-2
        
    




    

    
    
        e)
        
    1.0 x 10-5
        
    




    
    

    
    







    
    
        


        



















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