The rate of a ligand substitution reaction of [Co H2O 6]2+ with chloride ion can be affected by concentration, temperature, and the presence of an inert ion. Here's how each factor can influence the reaction rate:1. Concentration: An increase in the concentration of the reactants, such as [Co H2O 6]2+ and chloride ions, will generally lead to an increase in the reaction rate. This is because a higher concentration of reactants increases the likelihood of successful collisions between the molecules, leading to a faster reaction.2. Temperature: An increase in temperature will also lead to an increase in the reaction rate. Higher temperatures provide the reactant molecules with more kinetic energy, which increases the frequency and energy of collisions between the molecules. This results in a higher probability of successful collisions and faster reaction rates.3. Presence of an inert ion: The presence of an inert ion, such as a spectator ion that does not participate in the reaction, can affect the reaction rate through the "salt effect." The salt effect can either increase or decrease the reaction rate, depending on the specific reaction and the ions involved. In some cases, the presence of an inert ion can stabilize the transition state or intermediate species, leading to a faster reaction rate. In other cases, the inert ion can cause a decrease in the reaction rate by shielding the reactants from each other or by stabilizing the reactants, making it more difficult for them to react.As for the mechanism of the ligand substitution reaction of [Co H2O 6]2+ with chloride ion, it can be described as either associative Ia or dissociative Id depending on the specific reaction conditions and the nature of the metal complex. In an associative mechanism, a new ligand in this case, the chloride ion approaches and forms a bond with the metal center before one of the original ligands H2O is released. In a dissociative mechanism, one of the original ligands is released from the metal center before the new ligand forms a bond.To determine which mechanism is more likely for this specific reaction, experimental data such as kinetic studies and activation parameters would be needed. However, for octahedral complexes like [Co H2O 6]2+, the ligand substitution reactions are often found to proceed via an associative Ia mechanism.