K2FeO4 is pretty cool stuff. It’s relatively easy to make, has a nice purple color, and it’s a stronger oxidant than permanganate. Oh… and it reacts with water. You can dissolve it in water, but unless the solution is fairly alkaline, it will decompose rapidly, generating O2 as a product. It is being investigated for use as a cathode material for so-called “super-iron” batteries (using zinc
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