The questions below refer to the following system: Co(H_2O)_6^2+ + 4Cl^- CoCl_4^

Question

The questions below refer to the following system: Co(H_2O)_6^2+ + 4Cl^- CoCl_4^2- + 6H_2O (pink) (blue) When cobalt(II) chloride is added to pure water, the Co^2+ ions hydrate. The hydrated form then reacts with the Cl^- ions to set up the equilibrium shown here. Which statement below describes the change that the system will undergo if hydrochloric acid is added? It should become more blue. It should become more pink. The equilibrium will shift to the right. The equilibrium will shift to the left. Two of these.

Explanation / Answer

[Co(H2O)6]+2 + 4 Cl - -------------------------> CoCl4-2 + 6 H2O

HCl ---------------------------> H+ + Cl-

from HCl , Cl- ions are generated . so the equilibrium will shift to the right . and color becomes more blue

so statements a and c are correct

answer : e) two of these

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