CHM 1025C  Sample Pretest          Name:___Answers_______

 

      Module Eight: Part G Rewriting Equations Ionically           10 points

Rewrite the following (unbalanced) equations ionically, cancel spectator ions and then balance the net ionic reactions.  Show as ions: soluble salts and strong acids and strong bases; leave as molecules/formula units insoluble salts, weak acids, covalent molecules. Strong acids are: Perchloric Acid; Hydrochloric Acid; Nitric Acid; Sulfuric Acid; Hydrobromic Acid; Hydroiodic Acid. Strong bases are Sodium hydroxide, potassium hydroxife, Calcium hydroxide, Barium hydroxide and Strontium hydroxide

 

1.    KOH (aq)         +        HNO3(aq)     à          KNO3(aq)         +          HOH(l)

 

         OH 1-          +        H 1+             à           HOH (l)

 

 

 

2.     CuSO4 (aq)     +      Na2CO3 (aq)   à     CuCO3  (s)          +      Na2SO4 (aq)

 

 

       Cu 2+            +         CO3 2-         à       CuSO4   (s)        

 

 

 

3.    NaOH (aq)    +     NH4NO3 (aq)   à   NaNO3 (aq)    +       NH3 (g)     +   HOH (l)

 

         

       OH 1-       +        NH4 1+      à    NH3 (g)   +  H2O (l)

 

 

 

 

4.    BaBr2 (aq)   +   ZnSO4 (aq)        à     BaSO4 (s)        +      ZnBr2   (aq)

 

            Ba 2+         +       SO4 2-          à       BaSO4 (s)

 

 

 

5.    Cr(OH)2 (s)   +   HCl   (aq)      à      CrCl2  (aq)        +  H2O (l)

 

 

      Cr(OH)2 (s)   +  2 H 1+ (aq)      à    Cr 2+ (aq)  +  2 H2O (l)