Problem Set
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Problem Set

 

Show your work; circle your answers.

 

1.   Determine the percent composition of the following solutions:

 

a.   25.6g CaCl2 in 405g of water

 

  

b.   89.3g of NaNO3 in 534g of solution

 

  

2.   How many moles and how many grams of solute are present in the following solutions:

 

a.   250.0 ml of 0.32 M H2SO4

  

 

 

b.   7.5 liter of 1.02 M NaOH

 

  

 

        c.              750 ml of 11%(w/v) saline (NaCl)

 

  


 

3.   If 95.0 mL of a 3.4 M KCl solution is diluted to 250.0 mL, what would be the new concentration?

 

 

  

4.   A standard solution of a chemical has a concentration of 1.50 M.  When measured at a particular wavelength it has an absorbance of 0.57.  Another solution of that chemical, measured at the same wavelength in the same size tube, has an absorbance of 0.75.  What is the concentration of that solution?

 

  

5.   Determine the species concentrations for the following solutions.

         3.50 M H3PO4                                [H+] =              [PO43-] =

 

         2.90 M MgCl2                                [Mg2+] =            [Cl-] =

 

         0.15 M Al(OH)3                              [Al3+] =            [OH-] =

 

 

6.   Ksp for CaF2 is 3.4 x 10-11

 

a.   Write the Ksp expression.

  

           b.      What is the concentration of the F- if the Ca+2 is 0.25M?

 

 

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