On the other hand, potassium manganate reacts in both acidic and alkaline media.


In an alkaline medium, chromium(VI) exists as potassium chromate instead of potassium dichromate:

$$\ce{Cr2O7^2- + 2OH- <=>> 2CrO4^2- + H2O}$$

Wikipedia has more information about this equilibrium.

  • $\begingroup$ Interesting information @orthocresol. Does this mean that the $\ce{CrO4^{2-}}$ ion have no oxidative abilities despite being in chromium's highest oxidation state? $\endgroup$ – Pritt says Reinstate Monica Jun 4 '17 at 4:59
  • 1
    $\begingroup$ No, chromate(VI) is still oxidising $\endgroup$ – orthocresol Jun 4 '17 at 6:30

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