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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Formiate</span></h1>
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<p>L'ion <b>formiate</b> (<a href="Nom_trivial" title="Nom trivial">nom trivial</a>) ou <b>méthanoate</b> (<a href="Nomenclature_syst%C3%A9matique" title="Nomenclature systématique">nomenclature systématique</a>), de formule HCOO<sup>−</sup>, est un <a href="Anion" title="Anion">anion</a> carboxylate, la <a href="Base_conjugu%C3%A9e" title="Base conjuguée">base conjuguée</a> de l'<a href="Acide_m%C3%A9thano%C3%AFque" title="Acide méthanoïque">acide méthanoïque</a> ou acide formique (HCOOH). Le terme formiate/méthanoate désigne également les <a href="Sel_(chimie)" title="Sel (chimie)">sels</a> ou <a href="Ester" title="Ester">esters</a> de cet <a href="Acide_carboxylique" title="Acide carboxylique">acide carboxylique</a>.
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<dl><dd><a href="Acide_m%C3%A9thano%C3%AFque" title="Acide méthanoïque">HCOOH<sub>(aq)</sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></a> + <a href="Eau" title="Eau">H<sub>2</sub>O<sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></a> <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \rightleftharpoons }">
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<annotation encoding="application/x-tex">{\displaystyle \rightleftharpoons }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/1c37b981df851b9e54e489e017b1481e37d418f3.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.324ex; height:1.843ex;" alt="{\displaystyle \rightleftharpoons }" loading="lazy"></span> <a href="Ion_hydronium" title="Ion hydronium">H<sub>3</sub>O<sup>+</sup><sub>(aq)</sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></a> + HCOO<sup>−</sup><sub>(aq)</sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub><sub></sub></dd></dl>
<div class="mw-heading mw-heading2"><h2 id="Demi-réaction_acide-base"><span id="Demi-r.C3.A9action_acide-base"></span>Demi-réaction acide-base</h2></div>
<ul><li>HCOOH = HCOO<sup>−</sup> + H<sup>+</sup>.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Exemples_de_sels_et_esters">Exemples de sels et esters</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Sels">Sels</h3></div>
<ul><li><a href="Formiate_de_lithium" title="Formiate de lithium">Formiate de lithium</a>, Li(HCOO).</li>
<li><a href="Formiate_de_sodium" title="Formiate de sodium">Formiate de sodium</a>, Na(HCOO).</li>
<li><a href="Formiate_de_potassium" title="Formiate de potassium">Formiate de potassium</a>, K(HCOO).</li>
<li><a href="Formiate_de_c%C3%A9sium" title="Formiate de césium">Formiate de césium</a>, Cs(HCOO).</li></ul>
<div class="mw-heading mw-heading3"><h3 id="Esters">Esters</h3></div>
<ul><li><a href="Formiate_de_m%C3%A9thyle" title="Formiate de méthyle">Formiate de méthyle</a>, HCOO-CH<sub>3</sub>.</li>
<li><a href="Formiate_d'%C3%A9thyle" title="Formiate d'éthyle">Formiate d'éthyle</a>, HCOO-CH<sub>3</sub>CH<sub>2</sub>.</li>
<li><a href="Formiate_de_propyle" title="Formiate de propyle">Formiate de propyle</a>.</li>
<li><a href="Formiate_de_n-butyle" title="Formiate de n-butyle">Formiate de n-butyle</a>.</li>
<li><a href="Formiate_de_pentyle" title="Formiate de pentyle">Formiate de pentyle</a>.</li>
<li><a href="Formiate_d'hexyle" title="Formiate d'hexyle">Formiate d'hexyle</a>.</li>
<li><a href="Formiate_d'heptyle" title="Formiate d'heptyle">Formiate d'heptyle</a>.</li>
<li><a href="Formiate_d'octyle" title="Formiate d'octyle">Formiate d'octyle</a>.</li>
<li><a href="Formiate_de_nonyle" title="Formiate de nonyle">Formiate de nonyle</a>.</li>
<li><a href="Formiate_de_cis-3-hex%C3%A9nyle" title="Formiate de cis-3-hexényle">Formiate de cis-3-hexényle</a>.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Voir_aussi">Voir aussi</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Articles_connexes">Articles connexes</h3></div>
<ul><li><a href="Chloroformiate" title="Chloroformiate">Chloroformiate</a> :
<ul><li><a href="Chloroformiate_de_m%C3%A9thyle" title="Chloroformiate de méthyle">Chloroformiate de méthyle</a>, ClCOO-CH<sub>3</sub></li>
<li><a href="Chloroformiate_de_benzyle" title="Chloroformiate de benzyle">Chloroformiate de benzyle</a>, ClCOO-CH<sub>2</sub>-C<sub>6</sub>H<sub>5</sub></li></ul></li>
<li>Orthoformiate :
<ul><li><a href="Orthoformiate_d'%C3%A9thyle" title="Orthoformiate d'éthyle">Orthoformiate de triéthyle</a> HC(OCH<sub>2</sub>CH<sub>3</sub>)<sub>3</sub></li>
<li><a href="Orthoformiate_de_m%C3%A9thyle" class="mw-redirect" title="Orthoformiate de méthyle">Orthoformiate de triméthyle</a>, HC(OCH<sub>3</sub>)<sub>3</sub></li></ul></li></ul>
<ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"></span></span> <span class="bandeau-portail-texte">Portail de la chimie</span> </span></li> </ul></div><!--htdig_noindex--><div><div class="zim-footer">
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