Cobalt(ll) chloride can form two complexes when dissolved in water [Co(H 2 O) 6 )^ 2 + (aq) which is pink in colour, and [CoCl 4 ]^ 2- (ac) which is blue. The equilibrium system [CO(H 2 O) 6 ]^ 2 +(aq)(pink)+4 Cl^ - (aq) doubleheaded arrow [CoCl 4 )^ 2- (aq)(blue)+ 6H 2 O(l)
Cobalt(ll) chloride can form two complexes when dissolved in water [Co(H 2 O) 6 )^ 2 + (aq) which is pink in colour, and [CoCl 4 ]^ 2- (ac) which is blue.
The equilibrium system [CO(H 2 O) 6 ]^ 2 +(aq)(pink)+4 Cl^ - (aq) doubleheaded arrow [CoCl 4 )^ 2- (aq)(blue)+ 6H 2 O(l)
(a) Describe how the system and its colour will change in each of the following situations
(I) HCL is added
(II) water is added
(III) AgNO 3 is added
if an aqueous solution of cobalt(II)chloride placed in a hot water bath at 90 Celsius,the solution will turn blue . If the solution is placed in an ice salt mixture , it will turn pink. Is the reaction as written above exothermic or endothermic ? Explain your reasoning
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