The chromate anion, CrO₄²¯, and the dichromate anion, Cr₂O₇²¯, are related to each other through the following acid-base equilibrium:
2CrO₄²¯(aq) + 2H₃O⁺(aq) ⇆ Cr₂O₇²¯(aq) + 3H₂O(l)
You convert the chromate into bichromate by lowering the pH.
Basically, the more acidic the solution, the more predominant the dichromate anion becomes. Poly condensation products are indeed known for strongly acidic solutions.
The chromate anion, CrO₄²¯, and the dichromate anion, Cr₂O₇²¯, are related to each other through the following acid-base equilibrium:
2CrO₄²¯(aq) + 2H₃O⁺(aq) ⇆ Cr₂O₇²¯(aq) + 3H₂O(l)
You convert the chromate into bichromate by lowering the pH.
Basically, the more acidic the solution, the more predominant the dichromate anion becomes. Poly condensation products are indeed known for strongly acidic solutions.
By condensation in the presence of acid…?
[math]underbrace{2CrO_{4}^{2-} +2H^{+} longrightarrow Cr_{2}O_{7}^{2-} + H_{2}O(l)}_{ ext{orange to red}}[/math]
Note that we both forms feature the [math]Cr(VI+)[/math] oxidation state…
By condensation in the presence of acid…?
[math]underbrace{2CrO_{4}^{2-} +2H^{+} longrightarrow Cr_{2}O_{7}^{2-} + H_{2}O(l)}_{ext{orange to red}}[/math]
Note that we both forms feature the [math]Cr(VI+)[/math] oxidation state…
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The chromate anion, CrO₄²¯, and the dichromate anion, Cr₂O₇²¯, are related to each other through the following acid-base equilibrium:
2CrO₄²¯(aq) + 2H₃O⁺(aq) ⇆ Cr₂O₇²¯(aq) + 3H₂O(l)
You convert the chromate into bichromate by lowering the pH.
Basically, the more acidic the solution, the more predominant the dichromate anion becomes. Poly condensation products are indeed known for strongly acidic solutions.
The chromate anion, CrO₄²¯, and the dichromate anion, Cr₂O₇²¯, are related to each other through the following acid-base equilibrium:
2CrO₄²¯(aq) + 2H₃O⁺(aq) ⇆ Cr₂O₇²¯(aq) + 3H₂O(l)
You convert the chromate into bichromate by lowering the pH.
Basically, the more acidic the solution, the more predominant the dichromate anion becomes. Poly condensation products are indeed known for strongly acidic solutions.
More
VOTE