1. write the chemical equation when excess chloride ion is added to aqueous solution of cobalt chloride. note observed color of each complex ion. 2. what is the likely composition of the solution when the intermediate or transition color is reached? how does this provide visual proof of the idea that not all reaction go to completion?
3. use lechatelier's principle to explain the color changes observed upon addition of water and calcium chloride to an equilibrium mixture of the two complex ions in this reaction. 4. what was the effect of adding agno3 on the position of equilibrium for these two complex ions? is this effect consistent with lechatelier's principle.

The element cobalt can form compounds in two different oxidation states, +2 and +3. 

The +2 state is more common.

The ion Co2+ (aq) is pink.

Other compounds of cobalt(II), which include both anhydrous Co2+ and complex ions, are commonly blue.

If an aqueous solution contains both cobalt(II) and chloride ions, the blue ion CoCl42- forms, in equilibrium with the pink Co2+ (aq) ion.

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation:

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.