When sodium hydroxide (NaOH) is added to the solution, it increases the concentration of hydroxide ions (OH⁻) and raises the pH, causing the equilibrium to shift to the left according to Le Chatelier's principle. As a result, the yellow CrO₄²⁻ ions will increase, and the solution will transition from orange to a more yellow color.
Chromate ions react according to the following equation where the left side of the reaction is yellow and the right side is orange.
CrO42-+2H+=Cr2O7^2-+H2O
A student add sodium hydroxide (NaOH) to the solution equilibrium. In 1 to 2 sentences describe and explain any changes to the solution that the student will observe.
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