Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN: 9781285199047
Author: John W. Moore, Conrad L. Stanitski
Publisher: Cengage Learning
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  1. (2 pts each) The following reactions have been allowed to reach equilibrium. Consider the following changes that are introduced to the system and predict the direction of the equilibrium shift (to the left or to the right).  If no equilibrium shift is expected, write "no change".

 

  1. PCl3(g) + Cl2(g) PCl5(g); some PCl5 is removed

                                                                                                                                    Ans.  ______________

  1. 2 SO3(g) 2 SO2(g) + O2(g); pressure is increased

                                                                                                                                    Ans.  ______________

  1. COBr2(g) + 18.2 kcal  CO(g) + Br2(g); temperature is increased

                                                                                                                        Ans.  ______________

  1. 2 NOBr(g) 2 NO(g) + Br2(g); catalyst is added

                                                                                                                        Ans.  ______________

  1. 2 NO(g) + Cl2(g) 2 NOCl(g); exothermic; temperature is increased

                                                                                                                        Ans.  ______________

  1. BaCO3 (s)    BaO(s)  +  CO2(g); BaO is added

                                                                                                                        Ans.  ______________

  1. PCl3(g) + Cl2(g) PCl5(g) + energy;  the reaction is cooled

                                                                                                                        Ans.  ______________

  1. HPO42- (aq) +  H2O(l)          PO43-(aq)  +  H3O+(aq);  NaOH is added

                                                                                                                        Ans.  ______________

  1. C2H4 (g) +  I2 (g)         C2H4I2 (g)  +  heat;  a catalyst is added

                                                                                                                        Ans.  ______________

  1. AgBr (s) Ag+ (aq) + Br- (aq); AgBr is added

                                                                                                                        Ans.  ______________

 

 

 

  1. (5 points) Use the Henderson-Hasselbalch equation to perform the following calculations. The Ka of acetic acid is 1.8 ´ 10–5.
    1. Buffer A: Calculate the mass of solid sodium acetate required to mix with 100.0 mL of 0.5 M acetic acid to prepare a pH 4 buffer.

 

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