A hydrated cobalt(III) complex, A, is heated in a crucible to remove the water of crystallisation. The anhydrous complex B is formed. The results are shown below:
The anhydrous complex B is analysed and found to have a molar mass of 345.4 g mol-1 and to contain the following percentage composition by mass:
Co, 17.05%; C, 20.85%; N, 24.32%; H, 6.95%; Cl, 30.83% \text{Co, } 17.05\%; \text{ C, } 20.85\%; \text{ N, } 24.32\%; \text{ H, } 6.95\%; \text{ Cl, } 30.83\% Co, 17.05%; C, 20.85%; N, 24.32%; H, 6.95%; Cl, 30.83%The anhydrous complex B contains a cation C comprising Co\text{Co}Co, C\text{C}C, N\text{N}N and H\text{H}H only.
Cation C is six-coordinate, contains three molecules of the bidentate ligand D, and exists as optical isomers.
Determine the formula of A, B, C and D and show the 3D structures for the optical isomers of C.
Show all your working.
48 exam-style questions on OCR A A Level Chemistry Transition elements. Each one has a worked solution and a mark scheme showing where the marks go.