{"id":5792,"date":"2026-10-15T01:45:09","date_gmt":"2026-10-14T22:45:09","guid":{"rendered":"https:\/\/wpcalc.com\/fr\/chimie\/calculateur-conductivite-molaire\/"},"modified":"2026-10-15T01:45:09","modified_gmt":"2026-10-14T22:45:09","slug":"calculateur-conductivite-molaire","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/fr\/chimie\/calculateur-conductivite-molaire\/","title":{"rendered":"Calculateur de conductivit\u00e9 molaire"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Conductivit\u00e9 molaire \u00e0 partir de la conductivit\u00e9 et de la concentration<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"5792\" data-favorite-title=\"Conductivit\u00e9 molaire\" data-favorite-url=\"https:\/\/wpcalc.com\/fr\/chimie\/calculateur-conductivite-molaire\/\" data-favorite-excerpt=\"Calculez la conductivit\u00e9 molaire (\u039bm) d&#039;une solution d&#039;\u00e9lectrolyte \u00e0 partir de sa conductivit\u00e9 mesur\u00e9e \u03ba et de sa concentration molaire c. Saisissez les deux valeurs avec leurs unit\u00e9s et obtenez le r\u00e9sultat en S\u00b7cm\u00b2\/mol et en S\u00b7m\u00b2\/mol.\" aria-label=\"Ajouter aux favoris\" data-favorite-icon=\"icon icon-scale\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/fr\/chimie\/calculateur-conductivite-molaire\/\" method=\"POST\" class=\"calculator\" id=\"calculator-5792\" data-post=\"5792\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Champs de saisie<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Conductivit\u00e9 de la solution (\u03ba)<\/label><div class=\"term\">\u03ba<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"conductivit_de_la_solution_\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 1.413\" min=\"0\" value=\"1.413\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"us\">\u00b5S\/cm<\/option><option value=\"ms\" selected>mS\/cm<\/option><option value=\"scm\">S\/cm<\/option><option value=\"sm\">S\/m<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-1\">Conductance sp\u00e9cifique mesur\u00e9e de la solution (la valeur affich\u00e9e par un conductim\u00e8tre \u00e0 25 \u00b0C).<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Concentration molaire (c)<\/label><div class=\"term\">c<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"concentration_molaire_c\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 0.01\" min=\"0\" value=\"0.01\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"mol_l\" selected>mol\/L (M)<\/option><option value=\"mmol_l\">mmol\/L (mM)<\/option><option value=\"mol_m3\">mol\/m\u00b3<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-3\">Concentration en quantit\u00e9 de mati\u00e8re de l&#039;\u00e9lectrolyte en solution.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalculer\" id=\"calculate-button\" data-post=\"5792\">Calculer<\/button><button type=\"reset\">R\u00e9initialiser<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculer automatiquement<\/label><small>Si activ\u00e9, le r\u00e9sultat se met \u00e0 jour automatiquement d\u00e8s que vous modifiez une valeur.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Conductivit\u00e9 molaire<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Conductivit\u00e9 molaire<\/span><span class=\"result-term\">\u039bm<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"S\u00b7cm\u00b2\/mol\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Conductivit\u00e9 molaire (SI)<\/span><span class=\"result-term\">\u039bm<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"S\u00b7m\u00b2\/mol\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>D\u00e9tails du calcul<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-4\"><span class=\"field-title\"><span>\u00c0 propos de la conductivit\u00e9 molaire<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copier le lien vers ce calcul<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Laisser un commentaire<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"5792\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">Que pensez-vous de ce r\u00e9sultat\u00a0?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">J\u2019aime <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Utile <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confus <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">D\u00e9\u00e7u <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inexact <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Conductivit\u00e9 molaire<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formule<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\Lambda_m = \\frac{\\kappa}{c} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>O\u00f9\u00a0:<\/strong><\/p>\n<ul>\n<li>\\(\\Lambda_m\\) \u2014 conductivit\u00e9 molaire (S\u00b7cm\u00b2\/mol ou S\u00b7m\u00b2\/mol)<\/li>\n<li>\\(\\kappa\\) \u2014 conductance sp\u00e9cifique (conductivit\u00e9) de la solution (S\/cm)<\/li>\n<li>\\(c\\) \u2014 concentration molaire de l'\u00e9lectrolyte (mol\/L)<\/li>\n<\/ul>\n<p>Lorsque \\(\\kappa\\) est exprim\u00e9e en S\/cm et \\(c\\) en mol\/L, la formule s'\u00e9crit sous sa forme pratique \\(\\Lambda_m = 1000\\,\\kappa \/ c\\), qui donne \\(\\Lambda_m\\) directement en S\u00b7cm\u00b2\/mol. Le facteur 1000 traduit la conversion entre mol\/L et mol\/cm\u00b3.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Conductivit\u00e9 molaire \u2013 Exemple de calcul<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemple\u00a0:<\/strong> une solution de chlorure de potassium \u00e0 0,01 mol\/L pr\u00e9sente \u00e0 25 \u00b0C une conductivit\u00e9 mesur\u00e9e de 1,413 mS\/cm. Quelle est sa conductivit\u00e9 molaire\u00a0?<\/p>\n<p>\\[ \\kappa = 1.413 \\text{ mS\/cm} = 1.413 \\times 10^{-3} \\text{ S\/cm} \\]<\/p>\n<p>\\[ \\Lambda_m = \\frac{1000 \\times 1.413 \\times 10^{-3}}{0.01} = 141.3 \\text{ S\u00b7cm}^2\\text{\/mol} \\]<\/p>\n<p>\\[ \\Lambda_m = \\frac{141.3}{10^4} = 0.014130 \\text{ S\u00b7m}^2\\text{\/mol} \\]<\/p>\n<p><strong>R\u00e9sultat\u00a0:<\/strong> la conductivit\u00e9 molaire vaut 141,3 S\u00b7cm\u00b2\/mol (0,01413 S\u00b7m\u00b2\/mol), une valeur typique pour KCl \u00e0 cette concentration.<\/p>\n<p>\n\r\n<\/section>\n<h2>Comment utiliser le calculateur de conductivit\u00e9 molaire<\/h2>\n<ol>\n<li>Saisissez la <strong>conductivit\u00e9 de la solution (\u03ba)<\/strong> mesur\u00e9e dans le premier champ\u00a0: la valeur affich\u00e9e par votre conductim\u00e8tre.<\/li>\n<li>Choisissez l'unit\u00e9 de la mesure de conductivit\u00e9 (\u00b5S\/cm, mS\/cm, S\/cm ou S\/m) dans la liste d\u00e9roulante plac\u00e9e \u00e0 c\u00f4t\u00e9.<\/li>\n<li>Saisissez la <strong>concentration molaire (c)<\/strong> de l'\u00e9lectrolyte dans le second champ.<\/li>\n<li>Choisissez l'unit\u00e9 de concentration (mol\/L, mmol\/L ou mol\/m\u00b3) dans la liste d\u00e9roulante correspondante.<\/li>\n<li>Lisez la <strong>conductivit\u00e9 molaire<\/strong> en S\u00b7cm\u00b2\/mol et la <strong>conductivit\u00e9 molaire (SI)<\/strong> en S\u00b7m\u00b2\/mol, accompagn\u00e9es du d\u00e9tail du calcul \u00e9tape par \u00e9tape.<\/li>\n<\/ol>\n<h2>Qu'est-ce que la conductivit\u00e9 molaire\u00a0?<\/h2>\n<p>La conductivit\u00e9 molaire \\(\\Lambda_m\\) (on parle aussi de conductance molaire) est la conductivit\u00e9 d'une solution d'\u00e9lectrolyte ramen\u00e9e \u00e0 une mole d'\u00e9lectrolyte dissous. La conductivit\u00e9 brute \\(\\kappa\\) mesur\u00e9e au conductim\u00e8tre d\u00e9pend de la quantit\u00e9 de sel dissoute\u00a0: une solution concentr\u00e9e d'un \u00e9lectrolyte peu conducteur et une solution dilu\u00e9e d'un bon conducteur peuvent donner la m\u00eame indication sur l'appareil. En divisant \\(\\kappa\\) par la concentration molaire \\(c\\), on l\u00e8ve cette ambigu\u00eft\u00e9 et l'on sait avec quelle efficacit\u00e9 une mole de la substance conduit le courant \u00e9lectrique.<\/p>\n<p>L'unit\u00e9 d'usage est le S\u00b7cm\u00b2\/mol, celle qu'emploient la plupart des manuels de chimie et des tables de r\u00e9f\u00e9rence. L'unit\u00e9 du SI est le S\u00b7m\u00b2\/mol, et la conversion est simple\u00a0: 1 S\u00b7m\u00b2\/mol = 10\u2074 S\u00b7cm\u00b2\/mol. Le calculateur affiche les deux, pour que vous puissiez vous conformer aux exigences de votre cours ou de votre publication.<\/p>\n<p>La conductivit\u00e9 molaire est surtout utile pour \u00e9tudier les \u00e9lectrolytes <strong>forts<\/strong> et <strong>faibles<\/strong>. Pour les \u00e9lectrolytes forts (NaCl, KCl, HCl), \\(\\Lambda_m\\) ne diminue que l\u00e9g\u00e8rement quand la concentration augmente, car les ions restent enti\u00e8rement dissoci\u00e9s et les attractions interioniques se contentent de les ralentir\u00a0; cette variation suit la loi de Kohlrausch \\(\\Lambda_m = \\Lambda_m^\\circ - K\\sqrt{c}\\). Pour les \u00e9lectrolytes faibles (acide ac\u00e9tique, ammoniac), \\(\\Lambda_m\\) chute fortement avec la concentration, car le degr\u00e9 de dissociation \\(\\alpha\\) diminue. Le rapport \\(\\Lambda_m \/ \\Lambda_m^\\circ\\) fournit une approximation de \\(\\alpha\\), sur laquelle repose la d\u00e9termination des constantes de dissociation \u2014 et, par extension, des <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/solubility-product-ksp-calculator\/\">produits de solubilit\u00e9<\/a> des sels peu solubles \u2014 \u00e0 partir de mesures de conductivit\u00e9.<\/p>\n<p>Pour situer les ordres de grandeur\u00a0: \u00e0 25 \u00b0C, les conductivit\u00e9s molaires limites \\(\\Lambda_m^\\circ\\) des \u00e9lectrolytes forts courants se situent grosso modo entre 100 et 430 S\u00b7cm\u00b2\/mol (KCl \u2248 149,9\u00a0; \u00bd H\u2082SO\u2084 \u2248 426). Un r\u00e9sultat tr\u00e8s en dehors de cette plage traduit g\u00e9n\u00e9ralement une erreur d'unit\u00e9 plut\u00f4t qu'une chimie inhabituelle.<\/p>\n<h2>Hypoth\u00e8ses, limites et conseils pratiques<\/h2>\n<ul>\n<li><strong>La conductivit\u00e9 doit \u00eatre une conductance sp\u00e9cifique.<\/strong> La valeur saisie doit d\u00e9j\u00e0 \u00eatre corrig\u00e9e de la constante de cellule, c'est-\u00e0-dire correspondre \u00e0 ce qu'affiche un conductim\u00e8tre \u00e9talonn\u00e9, et non \u00e0 la conductance brute.<\/li>\n<li><strong>La concentration se rapporte \u00e0 l'unit\u00e9 formulaire.<\/strong> Si la solution est \u00e9tiquet\u00e9e en fraction de formule (par ex. \u00bd H\u2082SO\u2084), saisissez la concentration en coh\u00e9rence avec cette d\u00e9finition, comme le font les tables de r\u00e9f\u00e9rence.<\/li>\n<li><strong>La temp\u00e9rature compte.<\/strong> La conductivit\u00e9 des solutions aqueuses augmente d'environ 2\u00a0% par \u00b0C. \\(\\kappa\\) et \\(c\\) doivent correspondre \u00e0 la m\u00eame temp\u00e9rature \u2014 25 \u00b0C est la r\u00e9f\u00e9rence standard.<\/li>\n<li><strong>M\u00e9fiez-vous des confusions d'unit\u00e9s.<\/strong> Les erreurs les plus fr\u00e9quentes consistent \u00e0 saisir des \u00b5S\/cm au lieu de mS\/cm, ou des mmol\/L au lieu de mol\/L. Le calculateur vous avertit lorsque le r\u00e9sultat est invraisemblablement grand (&gt;500 S\u00b7cm\u00b2\/mol) ou petit (&lt;5 S\u00b7cm\u00b2\/mol).<\/li>\n<li><strong>Conductivit\u00e9 de fond.<\/strong> Dans les solutions tr\u00e8s dilu\u00e9es, le CO\u2082 dissous et les impuret\u00e9s du solvant contribuent \u00e0 \\(\\kappa\\) et gonflent \\(\\Lambda_m\\)\u00a0; soustrayez la conductivit\u00e9 du solvant pur si vous travaillez \u00e0 des concentrations micromolaires.<\/li>\n<li>Le calculateur se limite au calcul \\(\\Lambda_m = \\kappa\/c\\). Pour extrapoler la conductivit\u00e9 molaire limite \\(\\Lambda_m^\\circ\\) d'un \u00e9lectrolyte fort, mesurez \\(\\Lambda_m\\) \u00e0 plusieurs concentrations et faites une r\u00e9gression en fonction de \\(\\sqrt{c}\\).<\/li>\n<\/ul>\n<h2>Conductivit\u00e9s molaires limites typiques \u00e0 25 \u00b0C<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u00c9lectrolyte<\/th>\n<th>\\(\\Lambda_m^\\circ\\) (S\u00b7cm\u00b2\/mol)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>KCl<\/td>\n<td>149,9<\/td>\n<\/tr>\n<tr>\n<td>NaCl<\/td>\n<td>126,5<\/td>\n<\/tr>\n<tr>\n<td>HCl<\/td>\n<td>426,2<\/td>\n<\/tr>\n<tr>\n<td>\u00bd H\u2082SO\u2084<\/td>\n<td>426<\/td>\n<\/tr>\n<tr>\n<td>CH\u2083COOH (faible)<\/td>\n<td>390,7<\/td>\n<\/tr>\n<tr>\n<td>NH\u2083\u00b7H\u2082O (faible)<\/td>\n<td>271<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ces valeurs valent \u00e0 dilution infinie\u00a0; \u00e0 concentration finie, la \\(\\Lambda_m\\) mesur\u00e9e est un peu plus faible. Si vous analysez \u00e9galement des \u00e9chantillons d'eau, les contr\u00f4les fond\u00e9s sur la conductivit\u00e9 se combinent naturellement avec notre <a href=\"https:\/\/wpcalc.com\/fr\/chimie\/calculateur-durete-eau\/\">calculateur de duret\u00e9 de l'eau<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculez la conductivit\u00e9 molaire (\u039bm) d'une solution d'\u00e9lectrolyte \u00e0 partir de sa conductivit\u00e9 mesur\u00e9e \u03ba et de sa concentration molaire c. Saisissez les deux valeurs avec leurs unit\u00e9s et obtenez le r\u00e9sultat en S\u00b7cm\u00b2\/mol et en S\u00b7m\u00b2\/mol.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[40],"class_list":["post-5792","post","type-post","status-publish","format-standard","hentry","category-chimie","tag-stoechiometrie"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/5792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/comments?post=5792"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/5792\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/media?parent=5792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/categories?post=5792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/tags?post=5792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}