Ex3_S07_ans

Ex3_S07_ans - Name _A.Key_ Chem 114 Exam 3 Total Points =...

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Problem Session All 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 ___basic______ ____NO 2 1- ___________ NaHSO 4 __acidic____________ ____HSO 4 1- ____________ HONH 3 Cl __acidic______________ ___HONH 3 1+ ___________ Al(ClO 4 ) 3 __acidic_______________ ___Al 3+ ______________ (2) 2. Give equilibrium equation and equilibrium constant expression for the K sp for CaC 2 O 4 . CaC 2 O 4 Ca 2+ + C 2 O 4 2- K sp = [Ca 2+ ][C 2 O 4 2- ] (3) 3. Give the net ionic equation for the hydrolysis of the salt KOCN. KOCN K 1+ + OCN 1- OCN 1- + H 2 O HOCN + OH 1- (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. __(CH 3 ) 2 NH 2 1+ ______ b) Give the chemical formula for the base form of the buffer. ____(CH 3 ) 2 NH______________ c) Give the net ionic equation for the reaction of the buffer with KOH. (CH 3 ) 2 NH 2 1+ + OH 1- (CH 3 ) 2 NH + H 2 O d) Give the net ionic equation for the reaction of the buffer with HBr. (CH
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Ex3_S07_ans - Name _A.Key_ Chem 114 Exam 3 Total Points =...

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