Question

Aerobic oxidation of Co(II) carbonate and aqueous ammonium chloride generates a pink complex (A) with a NH3:Co ratio of 4:1 and chloride counterions. On addition of HCl to a solution of A, a gas is rapidly evolved. The solution slowly turns violet on heating and yields a new complex B with a molecular formula of CoCl3・4NH3. When B is heated in concentrated HCl, a green complex C can be isolated with an identical ratio of CoCl3・4NH3. (i) Write the molecular formula of A and identify the gas evolved when A is treated with HCl. (ii) Write a balanced equation for the formation of B from A. (iii) Describe the relationship between complex B and C. (iv) Draw the structures of B and C using the following information. The isomer of [Co(Cl)2(en)2] + that is resolvable into enantiomers is violet.

          Aerobic oxidation of Co(II) carbonate and aqueous ammonium chloride generates a pink complex (A) with a NH3:Co ratio of 4:1 and chloride counterions. On addition of HCl to a solution of A, a gas is rapidly evolved. The solution slowly turns violet on heating and yields a new complex B with a molecular formula of CoCl3・4NH3. When B is heated in concentrated HCl, a green complex C can be isolated with an identical ratio of CoCl3・4NH3. (i) Write the molecular formula of A and identify the gas evolved when A is treated with HCl. (ii) Write a balanced equation for the formation of B from A. (iii) Describe the relationship between complex B and C. (iv) Draw the structures of B and C using the following information. The isomer of [Co(Cl)2(en)2] + that is resolvable into enantiomers is violet.

Added by Sherry P.

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