Answer to Question #204806 in Chemistry for Jake

Question

3)

According to the following equilibrium:

Cr2O7^2-(aq) + H20(l) ⇌ 2CrO4^2- (aq) + 2H^+ (aq)

orange                yellow

Explain why a solution containing the following equilibrium system turns yellow when

sodium hydroxide is added.

I need help with this

Answer 1

Sodium hydroxide leads to the neutralization of protons H⁺ decreasing their concentration in the solution. As the concentration of the product of the reaction decreases, the reaction shifts to the right increasing the production of CrO₄^2-. As a result, the systems turns yellow.