When cobalt (II) chloride is added to pure water the Co2+ ionshydrate. The hydra

Question

When cobalt (II) chloride is added to pure water the Co2+ ionshydrate. The hydrated form then reacts with Cl- ions to set up theequilibrium shown here: Co(H2O)62+(aq) + 4Cl-(aq) CoCl42-(aq) + 6H2O (l) (pink)       (blue) The hydrated Co2+ ion creates a pink coloredsolution and the CoCl42- ion creates ablue solution. Indicate how the color of the equilibrium solutionwill change as the following changes are made to a solution at equilibrium. Mark CorrectAnswer a. HCl is added. more pink    more blue   no change b. H2O is added, doubling the volume.   morepink more blue    no change c. AgNO3 is added. (AgCl is insoluble) more pink more blue    no change When cobalt (II) chloride is added to pure water the Co2+ ionshydrate. The hydrated form then reacts with Cl- ions to set up theequilibrium shown here: Co(H2O)62+(aq) + 4Cl-(aq) CoCl42-(aq) + 6H2O (l) (pink)       (blue) The hydrated Co2+ ion creates a pink coloredsolution and the CoCl42- ion creates ablue solution. Indicate how the color of the equilibrium solutionwill change as the following changes are made to a solution at equilibrium. Mark CorrectAnswer a. HCl is added. more pink    more blue   no change b. H2O is added, doubling the volume.   morepink more blue    no change c. AgNO3 is added. (AgCl is insoluble) more pink more blue    no change

Explanation / Answer

a. no change because neither H+ or Cl- react with the species oneither side of the reaction. b. adding H2O dilutes the concentrations of the species. Q =[CoCl4]/ [Co(H2O)][Cl-]^4. Q will become much less than K, so thereaction will move forward and become more blue. c. adding Ag+ ions will remove Cl- ions from solution in the formof AgCl precipitate. According to lechatelier's, the reaction willthen move to the right and become more pink.

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