Lycoming College                                         Quiz 5                                                   Write name on back

Chem 110, 2002                                                                                                                       upper right.

 

 

 

1.      Determine the sodium ion concentration and total ion concentration in a solution of Na3PO4 that is

0.0145 M Na3PO4.

 

 

Na+ concentration = ______________;  total ion concentration = ___________________

 

2.   Indicate whether each of the following is a strong electrolyte, weak electrolyte, or non-electrolyte.

 

a.       CH3CH2OCH2CH3            ______________________________

 

b.      Mg(NO3)2                          ______________________________

 

c.       KOH                                 ______________________________

                                               

d.      HI                                      ______________________________

 

e.       C6H5COOH                        _____________________________

 

3.     When an aqueous solution of copper(II) nitrate (Cu(NO3)2) is mixed with a solution of sodium sulfide (Na2S), a brown-black insoluble precipitate forms.  Deduce the formula of the precipitate, and write balanced ion and net ionic equations to represent the chemical reaction.

 

Ionic Equation:

 

 

 

Net Ionic Equation:

 

 

 

4.   Indicate the oxidation state of

 

 

            a.   Mn in MnO41-  __________;     b.  Mn in MnO2  ___________;  c.  Cr in BaCrO4 _________

 

 

5.   Balance the following redox equation:

 

 

            ____SeO32-     +   ____I1-      +   ____ H+            ____Se      +     ____ I2    +   ____H2O