Applying Le Chateliers principle, what can you conclude about the change #2CrO_4^(-2) - Cr_2O_7^(-2)# and its dependence on hydrogen ions, #H^+#?

Question

Applying Le Chateliers principle, what can you conclude about the change #2CrO_4^(-2) -> Cr_2O_7^(-2)# and its dependence on hydrogen ions, #H^+#?

Luna Chen · Accepted Answer

Adding more hydrogen ions would favour the formation of #Cr_2O_7^(-2)#

Removing hydrogen ions would favour the formation of #CrO_4^(-2)# The equation for net ions is: #2CrO_4^(-2) + "2H"^"+"⇌ Cr_2O_7^(-2) + "H"_2"O"# There are #2 H^+# ions on the LHS and none on the RHS. based on the principle of Le Chatelier; Adding more hydrogen ions (making conditions more acidic) would favour the formation of #Cr_2O_7^(-2)# because the equilibrium would shift to the side with fewer hydrogen ions to balance the system. Removing hydrogen ions (making conditions more basic) would favour the formation of #CrO_4^(-2)# because the equilibrium would shift to the side with more hydrogen ions to balance the system.

Serenity Allen · Answer

undefined Increasing the concentration of hydrogen ions (H⁺) will shift the equilibrium of the reaction 2CrO₄²⁻ → Cr₂O₇²⁻ to the left, favoring the formation of chromate ions (CrO₄²⁻). Conversely, decreasing the concentration of hydrogen ions will shift the equilibrium to the right, favoring the formation of dichromate ions (Cr₂O₇²⁻).

Jeremiah Adams · Answer

undefined The reaction 2CrO4^(-2) -> Cr2O7^(-2) involves the chromate ion (CrO4^(-2)) converting to the dichromate ion (Cr2O7^(-2)). When the concentration of hydrogen ions (H^+) increases, Le Chatelier's principle predicts that the equilibrium will shift to counteract the increase in H^+. Since the reaction consumes hydrogen ions, the equilibrium will shift to the right to consume more H^+ ions. Therefore, increasing the concentration of H^+ ions will favor the formation of Cr2O7^(-2).

Applying Le Chateliers principle, what can you conclude about the change #2CrO_4^(-2) -&gt; Cr_2O_7^(-2)# and its dependence on hydrogen ions, #H^+#?

Applying Le Chateliers principle, what can you conclude about the change #2CrO_4^(-2) -> Cr_2O_7^(-2)# and its dependence on hydrogen ions, #H^+#?