CHEM 1115 Unit 4 Practice Problems

 

 

1.      Complete and balance the following reactions.  Include the physical state of each of the products.

 

      a)       BaCl2(aq)  +     Na2SO4(aq)  ®

 

      b)       AlCl3(aq)  +       AgNO3(aq)  ®

 

 

2.      Write the complete ionic equation and the net ionic equation for the following:

 

a)  Fe(NO3)3(aq) + 3KOH(aq) ® Fe(OH)3(s) + 3KNO3(aq)

 

b)  3Fe(C2H3O2)2(aq) + 2Na3PO4(aq) ® Fe3(PO4)2(s) + 6NaC2H3O2 (aq)

 

 

 

3.      Complete and balance the following acid-base neutralization reactions.  Write the complete ionic equation and the net ionic equation for each reaction.

 

      a)  Fe(OH)3(s)  +        HCl(aq) ®

 

      b)  Al(OH)3(s)  +       H2SO4(aq) ®

 

 

4.      Determine the oxidation numbers of all of the elements in the following compounds:

 

a)   Ca(MnO4)2             b)   KHSO3              c)  K2S2O3      d) (NH4)2SO4      e)   O2

 

 

 

5.      Write complete ionic and net ionic equations for the following reactions:

 

      Pb(s) +  Cu(NO3)2 (aq) ®  Pb(NO3)2  (aq) + Cu(s)

 

      Fe(s) +  2HCl(aq) ®  FeCl2 +  H2(g)

 

 

6.      Each reaction shown in question 5 is a redox reaction.  For each reaction, identify the element oxidized, element reduced, oxidizing agent, and reducing agent.

 

7.      What volume of 1.30 M K2SO4 is needed to provide 0.330 mol K2SO4 for a reaction?

 

8.      What volume of 2.00 M NaClO3 contains 60.0 g of NaClO3?

 

9.      What volume of 2.40 M MgCl2 is needed to provide 0.225 mol of chloride ion to a reaction?

 

10.  What mass of Na2SO4 is needed to make 250.0 mL of 0.850 M Na2SO4?

 

11.  Describe in detail how you would prepare 500.0 mL of 1.00 M NaCl from solid NaCl.

12.  What volume of 12.0 M HCl is needed to prepare 600.0 mL of 1.75 M HCl?

 

13.  Describe in detail how you would prepare 250.0 mL of 2.0 M HCl from 12.0 M HCl.

 

14.  What is the molarity of a solution prepared by dissolving 85.0 g of NaCl in enough water to make 125 mL of solution?

 

15.  How many grams of calcium carbonate can be produced by reacting 50.0 mL of 0.50 M sodium carbonate with an excess of calcium chloride? (Hint:  Write a balanced equation first.)

 

16.  How many mL of 0.15 M calcium chloride is needed to react completely with 37.5 mL of 0.25 M sodium carbonate?  (Hint:  Write a balanced equation first.)

 

17.  How many mL of 0.25 M phosphoric acid are needed to react completely with 25.0 mL of  0.25 M calcium hydroxide? (Hint: Write a balanced equation first.)

 

18.  What is the concentration of an H2SO4 solution if 80.0 mL is neutralized by 36.2 mL of 1.50 M NaOH?

 

                        2NaOH + H2SO4 ® 2H2O + Na2SO4