The following statements discuss some coordination compounds. For each coordination compound, give the complex ion and the counterions, the electron configuration of the transition metal, and the geometry of the complex ion.

a. CoCl₂ ? 6H₂O is a compound used in novelty devices that predict rain. 

b. During the developing process of black-and-white film, silver bromide is removed from photographic film by the fixer. The major component of the fixer is sodium thiosulfate. The equation for the reaction is:  

c. In the production of printed circuit boards for the electronics industry, a thin layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of a chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching, and the protective polymer is finally removed by solvents. One etching reaction is:

Assume these copper complex ions have tetrahedral geometry.

Transcribed Image Text:

AgBr(s) + 2Na₂S₂O3(aq) Na, [Ag (S₂03)₂](aq) + NaBr(aq)