Quiz Grade _________         Quiz 3     Name ____________________
June 26, 1996               CHM 1046                             
                                   Soc.Sec.Num.__________________

     This quiz is take-home and open book.  The completed quiz is
due at the beginning of class on Friday, June 28.  

Points

(6)1.Calculate the pH of a solution containing the following
     mixtures of acids and their conjugate bases.

     (a)  0.035 M formic acid and 0. 023 M sodium formate









     (b)  0.085 M hydrochloric acid and 0.015 M sodium chloride.









     (c)  0.033 M ammonia and 0.016 M ammonium chloride.










(4)2.Determine the pH of the final solution after 24.2 mL of
     0.125 M sodium hydroxide is added to 50.0 mL of 0.0975 M
     nitric acid.


















(4)3.Determine the pH of the final solution after 24.2 mL of
     0.125 M sodium hydroxide is added to 50.0 mL of 0.975 M acetic
     acid.



















(6)5.You are given 125 mL of a buffer which is 0.097 M in ammonia and 0.078
     M in ammonium chloride.  To this buffer is added 25.0 mL of
     0.113 M perchloric acid.  Calculate the pH of the buffer
     before and after the addition of the perchloric acid.