Question

7. Consider the chromate/dichromate ion equilibrium: 2 CrO4^2- (aq) + 2 H^+ (aq) ? Cr2O7^2- (aq) + H2O (l) yellow orange a) What color will a solution be, if it contains only K2CrO4? b) Add H2SO4 to the K2CrO4 solution. H2SO4 is a strong acid that dissociates to increase [H+] in the solution according to the following reactions. H2SO4 (aq) ? H^+ (aq) + HSO4^- (aq) HSO4^- (aq) ? H^+ (aq) + SO4^2- (aq) How does increasing the concentration of H^+ affect the chromate/dichromate equilibrium position? What color will the solution be after we add H2SO4? c) When we add NaOH to the solution, it dissociates to form Na^+ and OH^-. What does OH^- react with in the solution? How does this reaction affect the chromate/dichromate equilibrium position? What color will the solution be?

          7. Consider the chromate/dichromate ion equilibrium:
2 CrO4^2- (aq) + 2 H^+ (aq) ? Cr2O7^2- (aq) + H2O (l)
yellow orange
a) What color will a solution be, if it contains only K2CrO4?
b) Add H2SO4 to the K2CrO4 solution. H2SO4 is a strong acid that dissociates to increase [H+] in the solution according to the following reactions.
H2SO4 (aq) ? H^+ (aq) + HSO4^- (aq)
HSO4^- (aq) ? H^+ (aq) + SO4^2- (aq)
How does increasing the concentration of H^+ affect the chromate/dichromate equilibrium position? What color will the solution be after we add H2SO4?
c) When we add NaOH to the solution, it dissociates to form Na^+ and OH^-. What does OH^- react with in the solution? How does this reaction affect the chromate/dichromate equilibrium position? What color will the solution be?

7. Consider the chromate/dichromate ion equilibrium:
2 CrO4^2- (aq) + 2 H^+ (aq) ? Cr2O7^2- (aq) + H2O (l)
yellow orange
a) What color will a solution be, if it contains only K2CrO4?
b) Add H2SO4 to the K2CrO4 solution. H2SO4 is a strong acid that dissociates to increase [H+] in the solution according to the following reactions.
H2SO4 (aq) ? H^+ (aq) + HSO4^- (aq)
HSO4^- (aq) ? H^+ (aq) + SO4^2- (aq)
How does increasing the concentration of H^+ affect the chromate/dichromate equilibrium position? What color will the solution be after we add H2SO4?
c) When we add NaOH to the solution, it dissociates to form Na^+ and OH^-. What does OH^- react with in the solution? How does this reaction affect the chromate/dichromate equilibrium position? What color will the solution be?

Added by Irene S.

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