{"id":2105,"date":"2026-10-14T20:16:54","date_gmt":"2026-10-14T19:16:54","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-constante-de-equilibrio-eletroquimica\/"},"modified":"2026-10-14T20:16:54","modified_gmt":"2026-10-14T19:16:54","slug":"calculadora-constante-de-equilibrio-eletroquimica","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-constante-de-equilibrio-eletroquimica\/","title":{"rendered":"Calculadora de constante de equil\u00edbrio eletroqu\u00edmica"},"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\">Encontre K a partir do potencial padr\u00e3o da c\u00e9lula<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2105\" data-favorite-title=\"Constante de equil\u00edbrio eletroqu\u00edmica\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-constante-de-equilibrio-eletroquimica\/\" data-favorite-excerpt=\"Informe o potencial padr\u00e3o da c\u00e9lula E\u00b0c\u00e9lula, o n\u00famero de el\u00e9trons transferidos n e a temperatura para encontrar a constante de equil\u00edbrio K de uma rea\u00e7\u00e3o de oxirredu\u00e7\u00e3o a partir de \u0394G\u00b0 = \u2212nFE\u00b0 = \u2212RT ln K.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-chemistry-1\">\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\/pt\/quimica\/calculadora-constante-de-equilibrio-eletroquimica\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2105\" data-post=\"2105\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Potencial padr\u00e3o da c\u00e9lula (E\u00b0cell)<\/label><div class=\"term\">E\u00b0cell<\/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=\"number\" name=\"potencial_padro_da_clula_ecell\" id=\"field-1\" aria-describedby=\"calc-info-1\" placeholder=\"e.g. 1.10\" step=\"any\" value=\"1.1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"V\" selected>V<\/option><option value=\"mV\">mV<\/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\">Diferen\u00e7a entre os potenciais padr\u00e3o de redu\u00e7\u00e3o: E\u00b0cell = E\u00b0c\u00e1todo \u2212 E\u00b0\u00e2nodo. S\u00e3o permitidos valores negativos, que simplesmente resultam em K &lt; 1.<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">El\u00e9trons transferidos (n)<\/label><div class=\"term\">n<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"eltrons_transferidos_n\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 2\" min=\"0\" value=\"2\"\/><small id=\"calc-info-3\">N\u00famero de el\u00e9trons trocados na rea\u00e7\u00e3o redox balanceada (ex.: 2 para Zn + Cu\u00b2\u207a \u2192 Zn\u00b2\u207a + Cu).<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-4\">Temperatura (T)<\/label><div class=\"term\">T<\/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=\"number\" name=\"temperatura_t\" id=\"field-4\" aria-describedby=\"calc-info-4\" placeholder=\"e.g. 25\" step=\"any\" value=\"25\"\/><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"C\" selected>\u00b0C<\/option><option value=\"K\">K<\/option><option value=\"F\">\u00b0F<\/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-4\">Temperatura da c\u00e9lula. 25 \u00b0C (298,15 K) \u00e9 a refer\u00eancia padr\u00e3o para os valores de E\u00b0 tabelados.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2105\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/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> Resultados da constante de equil\u00edbrio<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Constante de equil\u00edbrio (K)<\/span><span class=\"result-term\">K<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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>log\u2081\u2080 K<\/span><span class=\"result-term\">log K<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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>Detalhes do c\u00e1lculo<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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>Sobre este c\u00e1lculo<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><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\">Copiar link para este c\u00e1lculo<\/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>Deixar um coment\u00e1rio<\/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=\"2105\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/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\">Curti <\/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\">\u00datil <\/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\">Confuso <\/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\">Decepcionado <\/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\">Impreciso <\/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>F\u00f3rmula da constante de equil\u00edbrio eletroqu\u00edmica<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\ln K = \\frac{nFE^\\circ_{cell}}{RT} \\quad \\Leftrightarrow \\quad \\log_{10} K = \\frac{nFE^\\circ_{cell}}{2.303\\,RT} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(K\\) \u2014 constante de equil\u00edbrio da rea\u00e7\u00e3o de oxirredu\u00e7\u00e3o (adimensional)<\/li>\n<li>\\(n\\) \u2014 n\u00famero de el\u00e9trons transferidos na rea\u00e7\u00e3o balanceada<\/li>\n<li>\\(F\\) \u2014 constante de Faraday, 96 485,33212 C\/mol<\/li>\n<li>\\(E^\\circ_{cell}\\) \u2014 potencial padr\u00e3o da c\u00e9lula, em volts (V)<\/li>\n<li>\\(R\\) \u2014 constante dos gases, 8,314462618 J\/(mol\u00b7K)<\/li>\n<li>\\(T\\) \u2014 temperatura absoluta em kelvin (K)<\/li>\n<\/ul>\n<p>A f\u00f3rmula combina duas express\u00f5es para a varia\u00e7\u00e3o da energia livre de Gibbs padr\u00e3o, \\(\\Delta G^\\circ = -nFE^\\circ_{cell}\\) e \\(\\Delta G^\\circ = -RT\\ln K\\). Ao igual\u00e1-las, v\u00ea-se que a voltagem da c\u00e9lula mede diretamente o quanto o equil\u00edbrio est\u00e1 deslocado para os produtos.<\/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>Constante de equil\u00edbrio eletroqu\u00edmica \u2013 exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> a c\u00e9lula de Daniell, Zn(s) + Cu\u00b2\u207a(aq) \u2192 Zn\u00b2\u207a(aq) + Cu(s), tem E\u00b0c\u00e9lula = 1,10 V e transfere n = 2 el\u00e9trons a 25 \u00b0C (298,15 K).<\/p>\n<p>\\[ \\log_{10} K = \\frac{nFE^\\circ_{cell}}{2.303\\,RT} = \\frac{2 \\times 96485.33 \\times 1.10}{2.303 \\times 8.3145 \\times 298.15} \\approx 37.19 \\]<\/p>\n<p><strong>Resultado:<\/strong> \\(K = 10^{37.19} \\approx 1.55 \\times 10^{37}\\). O equil\u00edbrio est\u00e1 esmagadoramente deslocado para o lado dos produtos \u2014 na pr\u00e1tica, a rea\u00e7\u00e3o \u00e9 completa.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora<\/h2>\n<ol>\n<li>Informe o <strong>potencial padr\u00e3o da c\u00e9lula (E\u00b0c\u00e9lula)<\/strong> como E\u00b0c\u00e1todo \u2212 E\u00b0\u00e2nodo e escolha V ou mV como unidade. Valores negativos s\u00e3o aceitos e simplesmente resultam em K &lt; 1.<\/li>\n<li>Informe os <strong>el\u00e9trons transferidos (n)<\/strong> \u2014 o n\u00famero de el\u00e9trons que se cancelam quando as duas semirrea\u00e7\u00f5es s\u00e3o combinadas (por exemplo, 2 para Zn + Cu\u00b2\u207a \u2192 Zn\u00b2\u207a + Cu).<\/li>\n<li>Informe a <strong>temperatura (T)<\/strong> e selecione \u00b0C, K ou \u00b0F. Os potenciais padr\u00e3o tabelados referem-se a 25 \u00b0C (298,15 K).<\/li>\n<li>Leia os resultados: a constante de equil\u00edbrio K (em nota\u00e7\u00e3o cient\u00edfica), o valor de log\u2081\u2080K e o c\u00e1lculo passo a passo, com a substitui\u00e7\u00e3o das constantes.<\/li>\n<\/ol>\n<h2>O que \u00e9 a constante de equil\u00edbrio eletroqu\u00edmica?<\/h2>\n<p>Toda rea\u00e7\u00e3o de oxirredu\u00e7\u00e3o tem uma constante de equil\u00edbrio que indica at\u00e9 onde ela avan\u00e7a antes de atingir o equil\u00edbrio. Para a c\u00e9lula de Daniell, K \u2248 10\u00b3\u2077 significa que o zinco met\u00e1lico reduz os \u00edons de cobre de forma praticamente completa. Medir quimicamente constantes t\u00e3o gigantescas \u00e9 tarefa imposs\u00edvel \u2014 as concentra\u00e7\u00f5es da esp\u00e9cie que \"perde\" ficam pequenas demais para serem medidas \u2014 mas o potencial da c\u00e9lula as fornece indiretamente e com grande sensibilidade.<\/p>\n<p>A liga\u00e7\u00e3o entre os dois \u00e9 a energia livre de Gibbs. Uma c\u00e9lula realiza trabalho el\u00e9trico igual a \\(nFE^\\circ_{cell}\\) por mol de rea\u00e7\u00e3o, e o mesmo \\(\\Delta G^\\circ\\) tamb\u00e9m determina K por meio de \\(\\Delta G^\\circ = -RT\\ln K\\). Como \\(F\/RT\\) \u00e9 um n\u00famero muito grande (cerca de 38,9 V\u207b\u00b9 a 25 \u00b0C por unidade de ln), cada volt de potencial da c\u00e9lula corresponde a muitas dezenas de pot\u00eancias de dez em K. Uma varia\u00e7\u00e3o de apenas 59,2 mV em E\u00b0c\u00e9lula desloca log\u2081\u2080K em uma unidade inteira por el\u00e9tron transferido.<\/p>\n<p>Interpretar o resultado \u00e9 simples: um E\u00b0c\u00e9lula positivo significa \\(\\Delta G^\\circ &lt; 0\\) e K &gt; 1 (produtos favorecidos em condi\u00e7\u00f5es padr\u00e3o); E\u00b0c\u00e9lula = 0 d\u00e1 K = 1; um E\u00b0c\u00e9lula negativo d\u00e1 K &lt; 1 (reagentes favorecidos). Quando |log\u2081\u2080K| ultrapassa cerca de 30, a rea\u00e7\u00e3o \u00e9 t\u00e3o unilateral que se torna experimentalmente indistingu\u00edvel de uma rea\u00e7\u00e3o completa \u2014 a calculadora exibir\u00e1 K como pot\u00eancia de dez, e n\u00e3o como n\u00famero comum.<\/p>\n<p>Para obter o pr\u00f3prio E\u00b0c\u00e9lula, procure os dois potenciais padr\u00e3o de redu\u00e7\u00e3o e subtraia-os, ou use nossa <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/standard-cell-potential-calculator\/\">calculadora de potencial padr\u00e3o da c\u00e9lula<\/a>. A mesma l\u00f3gica baseada em atividades que est\u00e1 por tr\u00e1s deste K tamb\u00e9m rege o <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/solubility-product-ksp-calculator\/\">produto de solubilidade Ksp<\/a>, e o balan\u00e7o de energia livre guarda paralelo com a <a href=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-lei-de-hess\/\">Lei de Hess<\/a>.<\/p>\n<h2>Premissas, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li><strong>Condi\u00e7\u00f5es padr\u00e3o:<\/strong> a f\u00f3rmula assume que todas as esp\u00e9cies t\u00eam atividade unit\u00e1ria (1 M para solutos, 1 bar para gases). Em qualquer solu\u00e7\u00e3o que n\u00e3o seja muito dilu\u00edda, as concentra\u00e7\u00f5es reais diferem das atividades \u2014 consulte a <a href=\"https:\/\/wpcalc.com\/pt\/quimica\/calculadora-coeficiente-atividade-debye-huckel\/\">calculadora de coeficiente de atividade Debye\u2013H\u00fcckel<\/a> para corre\u00e7\u00f5es em solu\u00e7\u00f5es i\u00f4nicas.<\/li>\n<li><strong>Rea\u00e7\u00e3o balanceada \u00e9 obrigat\u00f3ria:<\/strong> n deve vir da equa\u00e7\u00e3o totalmente balanceada. Multiplique as semirrea\u00e7\u00f5es para cancelar os el\u00e9trons antes de cont\u00e1-los; um n errado desloca log\u2081\u2080K proporcionalmente.<\/li>\n<li><strong>Consist\u00eancia de temperatura:<\/strong> os valores tabelados de E\u00b0 s\u00e3o medidos a 25 \u00b0C. Se voc\u00ea informar outra temperatura, a calculadora aplica a rela\u00e7\u00e3o formal corretamente, mas o E\u00b0c\u00e9lula real tamb\u00e9m varia um pouco com T \u2014 trate, portanto, os resultados fora de 25 \u00b0C como aproxima\u00e7\u00f5es.<\/li>\n<li><strong>Algarismos significativos:<\/strong> os potenciais padr\u00e3o costumam ser citados com 2 a 3 casas decimais; por isso, o log\u2081\u2080K raramente faz sentido al\u00e9m de 2\u20133 algarismos significativos, e o pr\u00f3prio K, al\u00e9m do primeiro d\u00edgito da mantissa.<\/li>\n<li><strong>K \u00e9 adimensional:<\/strong> trata-se da constante termodin\u00e2mica baseada em atividades, n\u00e3o do quociente de concentra\u00e7\u00f5es molares. Em solu\u00e7\u00f5es dilu\u00eddas, as duas praticamente coincidem.<\/li>\n<li><strong>n n\u00e3o inteiro:<\/strong> a calculadora aceita n fracion\u00e1rio (por exemplo, por mol de uma unidade de f\u00f3rmula escolhida), mas, nesse caso, K refere-se \u00e0 rea\u00e7\u00e3o escrita exatamente dessa forma \u2014 mudar a forma de dividir a equa\u00e7\u00e3o muda n e K juntos.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Informe o potencial padr\u00e3o da c\u00e9lula E\u00b0c\u00e9lula, o n\u00famero de el\u00e9trons transferidos n e a temperatura para encontrar a constante de equil\u00edbrio K de uma rea\u00e7\u00e3o de oxirredu\u00e7\u00e3o a partir de \u0394G\u00b0 = \u2212nFE\u00b0 = \u2212RT ln K.<\/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":[3],"tags":[67],"class_list":["post-2105","post","type-post","status-publish","format-standard","hentry","category-quimica","tag-reacoes"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2105"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2105\/revisions"}],"predecessor-version":[{"id":2695,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2105\/revisions\/2695"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2105"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}