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I recently discovered that the Cr(OH)3 precipitated during group three testing in qualitative analysis is actually Cr2O3.xH2O. Why are these two formulae used interchangeably, and is there a list of hydrated oxides which are written as their corresponding hydroxides?

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    $\begingroup$ It is neither of them. Both are simplifications. $\endgroup$
    – Poutnik
    Jun 22 at 4:10
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    $\begingroup$ Duplicate: chemistry.stackexchange.com/questions/29292/… but it doesn't have a positive upvoted answer. $\endgroup$ Jun 22 at 4:13
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    $\begingroup$ They are multicenter OH- and H2O metal complexes, interconnected by O and OH- bridges, formally expressible as non-stoichiometric oxide hydrates. $\endgroup$
    – Poutnik
    Jun 22 at 5:36

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