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n the first reaction, two different coloured Co(II) complex ions, [Co(H2O)6]2+ and [CoCl4]2-, exist together in equilibrium in solution in the presence of chloride ions: [Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) ⇌ [CoCl4]2-(aq)(blue) + 6H2O(l) This equilibrium can be disturbed when water, H2O is added. Predict what will happen. a The equilibrium will move to the right. b [CoCl4]2- concentration decreases. c [Co(H2O)6]2+concentration decreases. d Forming more blue complex.