Ex3_S07 - Name Chem 114 Exam 3 Total Points = 105 Problem...

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Name ___________________ Problem Session _____ Chem 114 Exam 3 Dr. A. H. Martin Total Points = 105 March 23, 2007 Calculations must be shown for credit on ALL problems, and ALL dependent variables, i.e. x's, must be defined. (8)1. Indicate whether aqueous solutions of the following salts are Acidic , Basic , or Neutral . For each nonneutral salt, also give the chemical formula of the ion that causes the shift from neutrality. acidic, basic, or neutral ion causing change Ba(NO 2 ) 2 ____________________ ____________________ NaHSO 4 _____________________ _____________________ HONH 3 Cl _____________________ _____________________ Al(ClO 4 ) 3 _______________________ ______________________ (2) 2. Give equilibrium equation and equilibrium constant expression for the K sp for CaC 2 O 4 . (3) 3. Give the net ionic equation for the hydrolysis of the salt KOCN. (15) 4. A buffer solution is 0.80 M in (CH 3 ) 2 NH and 0.40 M in (CH 3 ) 2 NH 2 NO 3 . Answer the following based on this buffer. (For (CH 3 ) 2 NH K b = 5.1x10 -4 ) a) Give the chemical formula of the acid form of the buffer. __________________ b) Give the chemical formula for the base form of the buffer. ________________________ c) Give the net ionic equation for the reaction of the buffer with KOH.
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