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Chromate/Dichromate Equilibrium

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NaOH is added to K2CrO4 and K2Cr2O7 separately in test tubes and a color change is noted.
HCl is added to the same two separte solutions in fresh test tubes and a colour change is noted.
Hcl is added to the first two mixtures
NaOH is added two the second until a colour change is noted.

A) What would the equations for the equilibrium be between H+ and CrO4 to produce Cr2O7 and H2O?

B) The summation equation showing both H+ and OH- in the equilibrium reaction between K2CrO4 and K2Cr2O7 ions?

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The solution regarding chromate/dichromate equilibrium provided in an attachment.

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