Equilibrium Color Changes and Reactions

The video tutorial explores the equilibrium between cobalt water and cobalt chloride complex ions, highlighting color changes as indicators of equilibrium shifts. Adding hydrochloric acid turns the solution blue, indicating a reverse shift. Adding water reverts it to pink, showing a forward shift. Silver nitrate removes chloride ions, causing another forward shift. Temperature changes also affect equilibrium, with heating favoring the endothermic direction and cooling favoring the exothermic direction.

What color change indicates the equilibrium shift when hydrochloric acid is added to the cobalt water complex ion?

• Pink to blue

• Blue to pink

• Green to yellow

• Yellow to green

What is the role of chloride ions in the equilibrium shift when hydrochloric acid is added?

• They decrease the concentration of the product

• They stabilize the equilibrium

• They have no effect

• They increase the concentration of the product

What happens to the equilibrium when water is added to the cobalt chloride complex ion?

• It shifts in the forward direction

• It becomes unstable

• It shifts in the reverse direction

• It remains unchanged

What is the result of adding silver nitrate to the cobalt chloride complex ion?

• Formation of a white solid

• Formation of a blue solid

• Formation of a pink solid

• No visible change

What does the formation of silver chloride indicate about the equilibrium?

• It becomes unstable

• It shifts to replace removed chloride ions

• It remains in the same position

• It shifts to remove more water

What color change occurs when the equilibrium mixture is heated?

• Pink to blue

• Green to yellow

• Blue to pink

• Yellow to green

What does the color change upon heating indicate about the reaction?

• It is endothermic in the forward direction

• It is exothermic in the forward direction

• It is exothermic in the reverse direction

• It is endothermic in the reverse direction

What happens to the equilibrium when the reaction mixture is cooled?

• It becomes unstable

• It shifts in the endothermic direction

• It remains unchanged

• It shifts in the exothermic direction

What does the color change from blue to pink upon cooling indicate?

• The reaction is endothermic in the reverse direction

• The reaction is exothermic in the reverse direction

• The reaction is endothermic in the forward direction

• The reaction is exothermic in the forward direction

What is the significance of the color change in the equilibrium mixture?

• It indicates a change in volume

• It reflects a change in pressure

• It shows a change in temperature

• It indicates a shift in equilibrium direction