Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the fo
ID: 1072553 • Letter: C
Question
Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl_2. It is usually supplied as the hexahydrate CoCl_2 middot 6H_2O. Two different coloured Co(II) complex ions, [Co(H_2O)_6]^2+ (pink) and [CoCl_4]^2-(blue), exist together in equilibrium in solution in the presence of chloride ions. Consider the following equilibrium system in an Erlenmeyer flask: [Co(H_2O)_6]^2+(aq) + 4Cl^-(aq) [CoCl_4]^2-(aq) + 6H_2O(l); Delta H > 0 kJ/mol Forward reaction is endothermic. Predict how the equilibrium position would change if: a) Water is added to the system b) Chloride is removed from the system c) The Erlenmeyer flask with content is cooled d) The Erlenmeyer flask with content is heated e) Carbon tetrachloride, CCU is added to the systemExplanation / Answer
a) addition of water will increase Volume, so concentrations decrease proportial, therefore the ^4 effect form Cl- will be critical, that is, shift will favour reactants
b)
Remocing Cl- will shift toward reactants, in order to counter balance Cl- loss
c)
Reaaction is endothermic, it requires heat
cooling will not favour prodeucts, but reactants
d)
reverse as in c
d)
addition of CCl4 will increase pressure, but has no effects, so this is inert, no effect