Photo AI
Chromate and dichromate ions form an equilibrium according to the following equation - HSC - SSCE Chemistry - Question 18 - 2010 - Paper 1
Question 18
Chromate and dichromate ions form an equilibrium according to the following equation. $$2CrO_4^{2-}(aq) + 2H^{+}(aq) \rightleftharpoons Cr_2O_7^{2-}(aq) + H_2O(l)$$... show full transcript
Worked Solution & Example Answer:Chromate and dichromate ions form an equilibrium according to the following equation - HSC - SSCE Chemistry - Question 18 - 2010 - Paper 1
Step 1
Which solution would increase the concentration of the chromate ion (CrO₄²⁻) when added to the equilibrium mixture?
Answer
Adding sodium acetate will increase the concentration of chromate ions. This is because sodium acetate provides acetate ions (CH₃COO⁻), which can interact with hydrogen ions (H⁺) in the solution. The equilibrium will shift to the left to consume the H⁺ ions in the solution, thereby increasing the concentrations of chromate ions (CrO₄²⁻) and water. This is explained by Le Châtelier's principle, which states that a system at equilibrium will adjust to counteract any changes made to it.