2009 Midterm

The total ionic equation is ba2 aq 2 cl aq 2 ag

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Unformatted text preview: f it. The total ionic equation is: Ba2+ (aq) + 2 Cl- (aq) + 2 Ag+ (aq) + SO42- (aq) → BaSO4 (s) + 2 AgCl (s). There are no ions that are found both on the left and on the right sides of this equation. 15. BaSO4 is known to be insoluble in water, while such salt as MgSO4 is readily soluble in water. Which of the following statements explaining this effect is true? A) The size of Mg2+ ion is smaller than the size of Ba2+ ion; therefore, the bond between ions in MgSO4 is more ionic making this compound soluble in water; B) The size of Mg2+ ion is greater than the size of Ba2+ ion; therefore, the bond between ions in MgSO4 is more ionic making this compound soluble in water; C) The size of Mg2+ ion is smaller than the size of Ba2+ ion; therefore, the bond between ions in MgSO4 is less ionic making this compound soluble in water; D) The size of Mg2+ ion is greater than the size of Ba2+ ion; therefore, the bond between ions in MgSO4 is less ionic making this compound soluble in water; E) The sizes of Mg2+ and Ba2+ are the same since they are in the same group of the periodic table. MgSO4 is soluble because it has a lower molecular weight. Chemistry 1024b, Winter 2009 Midterm Exam with Solutions Page 5 out of 9 16. Consider the following reaction: HClO4 (aq) + KOH (aq) → KClO4 (aq) + H2O (l) What are the spectator ions in this reaction? A) K+ and ClO4-; B) H+ and OH-; C) none; D) K+; E) H+, K+, ClO4- and OH-. To answer the question, we need to write the total ionic equation and indicate which ions are found both on the left and on the right sides of it. Furthermore, since this is an acid-base reaction, we need to consider if we have a strong or weak acid and a strong or weak base. HClO4 (aq) + KOH (aq) are both a strong acid and a strong base. They dissociate in full into ions in aqueous solutions. Therefore, the net ionic equation is: H+ (aq) + ClO4- (aq) + K+ (aq) + OH- (aq) → K+ (aq) + ClO4- (aq) + H2O (l). The spectator ions are K+ and ClO4-. 17. Consider the following reaction: HClO (aq) + KOH (aq) → KClO (aq) + H2O (l) What are the spectator ions in this...
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This note was uploaded on 02/13/2014 for the course CHEM 1024 taught by Professor Dr.zhifengding during the Winter '12 term at UWO.

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