For each of the equilibrium systems in this lab. Write the balanced chemical rea

Question

For each of the equilibrium systems in this lab. Write the balanced chemical reaction for the equilibrium system that is being studied. Be sure to note what is observable (e.g. color, precipitate...) Describe the stress(es) on the equilibrium, and the response(s) of the system to the stress(es) based on your observations (e.g. color change, amount of precipitate...) Explain why the system responded as it did using LeChatlier's principle. Be sure to include a balanced chemical equation for any secondary reaction which may have happened. Is the following reaction exothermic or endothermic? Explain. Fe^3+(aq) + SCN^- (aq) doubleheadarrow FeSCN^2+(aq) The complex ion Co(H_2O)_6^+2 (aq) is pink when placed in solution. Addition of chloride ions creates an equilibrium with CoCl_4^2 in the solution, which is blue in color. a. What the balanced reaction for the equilibrium. If CoCl_4^2- solubility is endothermic, predict what will happen to the solution color if the solution is heated. b. What will happen if the solution is cooled?

Explanation / Answer

(2)

The reaction between iron ion and thiocyanate ion is exothermic, which means increasing the temperature will cause the reaction to proceed in reverse direction.

(3)

(a)

Since the formation of CoCl42- complex is endothermic, so if solution is heated, more of this complex will be formed and solution will become blue in color.

(b)

If solution is cooled, more of the cobalt aqua complex will be formed and the solution will be pink in color.

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