In order to understand how changing the pH affects the equilibrium position of a redox reaction between iron II and dichromate ions, we first need to write the balanced chemical equation for the reaction in acidic and basic solutions.In acidic solution:6 Fe + CrO + 14 H 6 Fe + 2 Cr + 7 HOIn basic solution:6 Fe + CrO + 2 OH 6 Fe + 2 Cr OH Now let's analyze the effect of changing the pH on the equilibrium position using Le Chatelier's principle, which states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust the equilibrium position to counteract the change.1. Increasing the pH making the solution more basic :In acidic solution, increasing the pH means decreasing the concentration of H ions. According to Le Chatelier's principle, the system will try to counteract this change by shifting the equilibrium position to the right, producing more H ions. This will result in the conversion of more Fe ions to Fe ions and CrO ions to Cr ions.In basic solution, increasing the pH means increasing the concentration of OH ions. According to Le Chatelier's principle, the system will try to counteract this change by shifting the equilibrium position to the left, consuming the excess OH ions. This will result in the conversion of more Fe ions to Fe ions and Cr OH to CrO ions.2. Decreasing the pH making the solution more acidic :In acidic solution, decreasing the pH means increasing the concentration of H ions. According to Le Chatelier's principle, the system will try to counteract this change by shifting the equilibrium position to the left, consuming the excess H ions. This will result in the conversion of more Fe ions to Fe ions and Cr ions to CrO ions.In basic solution, decreasing the pH means decreasing the concentration of OH ions. According to Le Chatelier's principle, the system will try to counteract this change by shifting the equilibrium position to the right, producing more OH ions. This will result in the conversion of more Fe ions to Fe ions and CrO ions to Cr OH .In summary, changing the pH of the solution will affect the equilibrium position of the redox reaction between iron II and dichromate ions. Increasing the pH will favor the formation of Fe and Cr ions in acidic solution and the formation of Fe and CrO ions in basic solution. Conversely, decreasing the pH will favor the formation of Fe and CrO ions in acidic solution and the formation of Fe and Cr OH in basic solution.