Consider the chromate-dichromate equilibrium shown where the chromate ion appear

Question

Consider the chromate-dichromate equilibrium shown where the chromate ion appears yellow, and the dichromate ion is orange. Determine how the equilibrium will be affected by the pH change and fill in the the statements accordingly Note: If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the terms are placed incorrectly. 2CrO:-(aq) + 2H + (aq) Cr20,-(aq) + H2OM Decreasing the pH The equilibrium will shift The color will change from to Then, increasing the pH The equilibrium will shift The color will change from to left no effect orange yellow right

Explanation / Answer

Concept to be used in the question:

when more reactant is added to (or some product is removed from) an equilibrium mixture, the net reaction moves in the forward direction to establish a new equilibrium state.

when product is added to (or some reactant is removed from) an equilibrium mixture, the net reaction moves in the reverse (backward) direction to establish a new equilibrium state.

PH= -log[H+] so PH increase means [H+] decrease

PH decrease means [H+] increase

Dichromate ion is orange

Chromate ion is yellow

Part 1 Decreasing PH means we are adding H+ which is in reactant side .....So equi will shift in forward direction

color will change from Yellow to Orange

Part 2

Increasing PH means we are removing H+ which is in reactant side .....So equi will shift in backward direction

color will change from Orange to yellow

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