Chromium(III) nitrate

<h2 id="structure">Structure</h2>
<p>The relatively complicated <a href="/facts/Chemical_formula/hghUtthl">formula</a> - [Cr(H2O)6](NO3)3•<a href="/facts/Water_of_crystallization/sbaKJNJX">3H2O</a> - betray a simple structure of this material.  The chromium centers are bound to six <a href="/facts/Aquo_ligand/eKudHVQy">aquo ligands</a>, and the remaining volume of the solid is occupied by three nitrate anions and three <a href="/facts/Water_of_crystallization/sbaKJNJX">molecules of water of crystallization</a>.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
</p>
<h2 id="properties-and-preparation">Properties and preparation</h2>
<p>The <a href="/facts/Anhydrous/A7B0fDLE">anhydrous</a> salt forms green crystals and is very soluble in water (in contrast to anhydrous <a href="/facts/Chromium(III)_chloride/1GwXxIFm">chromium(III) chloride</a> which dissolves very slowly except under special conditions). At 100 °C it decomposes. The red-violet hydrate is highly soluble in water.  Chromium nitrate is used in the production of <a href="/facts/Alkali_metal/IkWbCLk2">alkali metal</a>-free <a href="/facts/Catalyst/LPBS7TQC">catalysts</a> and in <a href="/facts/Pickling_(metal)/nnhPycNe">pickling</a>.
</p><p>Chromium nitrate can be prepared by dissolving <a href="/facts/Chromium_oxide/HaxtA3q8">chromium oxide</a> in <a href="/facts/Nitric_acid/UDbwGp6s">nitric acid</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Anger, Gerd; Halstenberg, Jost; Hochgeschwender, Klaus; Scherhag, Christoph; Korallus, Ulrich; Knopf, Herbert; Schmidt, Peter; Ohlinger, Manfred (2000). "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_067. ISBN 3527306730. <a href="3527306730" target="_blank">3527306730</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Lazar, D.; Ribár, B.; Divjaković, V.; Mészáros, Cs. (1991). "Structure of Hexaaquachromium(III) Nitrate Trihydrate". Acta Crystallographica Section C Crystal Structure Communications. 47 (5): 1060–1062. doi:10.1107/S0108270190012628. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Anger, Gerd; Halstenberg, Jost; Hochgeschwender, Klaus; Scherhag, Christoph; Korallus, Ulrich; Knopf, Herbert; Schmidt, Peter; Ohlinger, Manfred (2000). "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_067. ISBN 3527306730. <a href="3527306730" target="_blank">3527306730</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
</ol>

Chromium(III) nitrate open-in-new

Chromium(III) nitrate