Cr2O7 2-(aq) + H2O(l) ⇌ 2 CrO4 2-(aq) + 2 H+(aq)
When adding NaOH :
• NaOH will react with H+
• NaOH + H+ → H2O + Na+
H+ is being consumed → H+ is a product in the equilibrium reaction
Chromium(VI) forms two different oxyanions, the orange dichromate ion, Cr 2O72-, and the yellow chromate ion, CrO42-. (See the following photos.) The equilibrium reaction between the two ions is
Cr2O7 2-(aq) + H2O(l) ⇌ 2CrO4 2-(aq) + 2 H+(aq)
Explain why orange dichromate solutions turn yellow when sodium hydroxide is added.
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