Arkansas State University Department of Chemistry and Physics

CHEM1013                                                                      Name______________________
Exam 3                                                                              Fall 1996

Show work on all problems for full credit.

1. List five properties of a base. (5 points)

 2. List five properties of an acid. (5 points)

 3. List the 3 Acid-Base theories mentioned in class and define an acid and base for each.  Correct spelling is important. (9 points)

 Theory 1:

  Acid ___________________________________

  Base ___________________________________

 Theory 2:

  Acid ___________________________________

  Base ___________________________________

 Theory 3:

  Acid ___________________________________

  Base ___________________________________
 

4. Calculate the concentration of a NaOH solution if 35.72 mL of NaOH is needed to neutralize 0.4500 g of KHP (FW = 204.2 g/mol).    (10 points)

  NaOH    +    KHP   ----->    H₂O    +     KNaP

5. Calculate the concentration of a H₃PO₄ solution if 25.00 mL of H₃PO₄ is needed to neutralize 1.306 g of KOH. (10 points)
 

  H₃PO₄    +   3 KOH   ----->   3 H₂O    +     K₃PO₄

6. Determine the oxidation number for the underlined element. (10 points)

Ag₂CO₃ _____                                      K₂SO₄ _____

Co(OH)₂ _____                                    Ba(NO₃)₂ _____

Hg₂Cl₂ _____

7. Tell if the half-reaction is an oxidation or a reduction.  (10 points)
 

a) Fe⁺²  ----->   Fe⁺³   __________________
 
 

b) Cu⁺²   ----->   Cu⁺   __________________
 
 

c) AsO₄^3-  ----->   AsO₂^-  __________________
 
 

d) MnO₄^-   ----->   MnO₂  __________________
 
 

e) 2 Cl^-   ----->    Cl₂  __________________