a. why does addition of hcl to the middle beaker cause the solution to turn blue? b. explain how and why the system of the middle beaker is still in equilibrium after the addition of hcl. c. why does addition of water to the middle beaker cause the solution to turn pink again? d. based off the color change upon exposure to different temperatures, is the reaction under study endothermic or exothermic? e. if there were a way to remove all the water from the system, what would you expect to observe?