{"id":1227,"date":"2024-07-31T08:00:09","date_gmt":"2024-07-31T11:00:09","guid":{"rendered":"https:\/\/cursaueducacao.com.br\/blog\/?p=1227"},"modified":"2024-09-17T15:24:10","modified_gmt":"2024-09-17T18:24:10","slug":"o-que-e-ph","status":"publish","type":"post","link":"https:\/\/cursaueducacao.com.br\/blog\/o-que-e-ph\/","title":{"rendered":"O que \u00e9 pH?"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Voc\u00ea certamente j\u00e1 estudou sobre pH nas aulas de bioqu\u00edmica da faculdade. Mas voc\u00ea sabe a defini\u00e7\u00e3o desse conceito ou consegue explicar com suas palavras o que ele significa? Muitos alunos t\u00eam dificuldade, e \u00e9 por isso que hoje voc\u00ea vai entender de uma vez por todas essa defini\u00e7\u00e3o. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">Em suma, pH nada mais \u00e9 do que uma medida que quantifica a acidez ou basicidade de uma solu\u00e7\u00e3o aquosa, ou seja, o quanto a solu\u00e7\u00e3o \u00e9 \u00e1cida ou b\u00e1sica. Derivado do termo latino &#8220;potentia hydrogenii&#8221;, que significa &#8220;potencial de hidrog\u00eanio&#8221;, esse potencial \u00e9 calculado como o logaritmo negativo da concentra\u00e7\u00e3o de \u00edons hidrog\u00eanio em uma solu\u00e7\u00e3o. A escala varia de 0 a 14, onde valores menores que 7 indicam uma solu\u00e7\u00e3o \u00e1cida, valores maiores que 7 indicam uma solu\u00e7\u00e3o b\u00e1sica (alcalina) e um valor de 7 representa uma solu\u00e7\u00e3o neutra.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conceito de pH<\/h2>\n\n\n\n<p class=\"has-medium-font-size\">A f\u00f3rmula matem\u00e1tica que define o pH \u00e9:<\/p>\n\n\n\n<p class=\"has-medium-font-size\">pH= \u2212log[H+]<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Aqui, [H+] representa a concentra\u00e7\u00e3o molar de \u00edons hidrog\u00eanio na solu\u00e7\u00e3o. Em uma solu\u00e7\u00e3o neutra, como a \u00e1gua pura, a concentra\u00e7\u00e3o de \u00edons H+ \u00e9 1 x 10^-7 moles por litro, resultando em um valor de 7. Em solu\u00e7\u00f5es \u00e1cidas, a concentra\u00e7\u00e3o de \u00edons H+ \u00e9 maior, enquanto em solu\u00e7\u00f5es b\u00e1sicas \u00e9 menor.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1030\" height=\"721\" src=\"https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-1030x721.png\" alt=\"a imagem mostra uma escala de pH\" class=\"wp-image-1234\" srcset=\"https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-1030x721.png 1030w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-300x210.png 300w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-768x538.png 768w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-1536x1075.png 1536w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-2048x1434.png 2048w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-1500x1050.png 1500w, https:\/\/cursaueducacao.com.br\/blog\/wp-content\/uploads\/2024\/07\/Untitled-705x494.png 705w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Import\u00e2ncia do pH<\/h2>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Biologia e sa\u00fade:<\/strong> Em fluidos corporais, como sangue e saliva, o pH \u00e9 rigorosamente regulado, pois desvios significativos podem ser prejudiciais. Por exemplo, no sangue, o valor normal varia entre 7,35 e 7,45. Altera\u00e7\u00f5es significativas podem levar a condi\u00e7\u00f5es como acidose ou alcalose, que podem ser fatais.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Agricultura:<\/strong> No solo, ele influencia a disponibilidade de nutrientes para as plantas. Solos muito \u00e1cidos ou muito alcalinos podem ser inadequados para o crescimento de determinadas culturas. Agricultores frequentemente ajustam o pH do solo usando cal (para aumentar) ou enxofre (para diminuir).<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Ind\u00fastria aliment\u00edcia:<\/strong> O pH \u00e9 vital no processamento e conserva\u00e7\u00e3o de alimentos. Por exemplo, valores baixos em conservas impede o crescimento de bact\u00e9rias patog\u00eanicas. A fermenta\u00e7\u00e3o de produtos como iogurte e queijo tamb\u00e9m dependem tamb\u00e9m desse controle para obter a textura e o sabor desejados.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Tratamento de \u00e1gua:<\/strong> No tratamento de \u00e1gua pot\u00e1vel e efluentes, o pH \u00e9 monitorado e ajustado para garantir que a \u00e1gua seja segura para consumo humano e que os processos de purifica\u00e7\u00e3o sejam eficazes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Medi\u00e7\u00e3o do pH<\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Existem diversas t\u00e9cnicas, desde m\u00e9todos simples at\u00e9 instrumenta\u00e7\u00e3o sofisticada:<\/p>\n\n\n\n<ol class=\"has-medium-font-size wp-block-list\">\n<li><strong>Indicadores de pH:<\/strong> S\u00e3o subst\u00e2ncias que mudam de cor dependendo do pH da solu\u00e7\u00e3o. Exemplos incluem o azul de bromotimol e a fenolftale\u00edna. Embora simples e baratos, os indicadores oferecem uma precis\u00e3o limitada.<\/li>\n\n\n\n<li><strong>Pap\u00e9is de Tornassol:<\/strong> S\u00e3o tiras de papel impregnadas com indicadores. Quando mergulhadas na solu\u00e7\u00e3o, mudam de cor conforme o pH, permitindo uma estimativa r\u00e1pida e f\u00e1cil.<\/li>\n\n\n\n<li><strong>pHmetros:<\/strong> S\u00e3o dispositivos eletr\u00f4nicos que medem o pH com alta precis\u00e3o. Utilizam um eletrodo de vidro sens\u00edvel a \u00edons H+, fornecendo uma leitura digital exata.<\/li>\n<\/ol>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aplica\u00e7\u00f5es avan\u00e7adas<\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Em laborat\u00f3rios de pesquisa, esse par\u00e2metro \u00e9 essencial para muitas rea\u00e7\u00f5es qu\u00edmicas e bioqu\u00edmicas. A atividade enzim\u00e1tica, por exemplo, \u00e9 altamente dependente do pH, com cada enzima tendo um valor \u00f3timo no qual sua atividade \u00e9 m\u00e1xima. Em bioqu\u00edmica, a regula\u00e7\u00e3o desse potencial \u00e9 crucial para estudos de cin\u00e9tica enzim\u00e1tica e estrutura de macromol\u00e9culas.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Gostou? Conhe\u00e7a nossos treinamentos:<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/cursaueducacao.com.br\/presencial\/coletores-de-elite\/\" target=\"_blank\" rel=\"noreferrer noopener\">Curso de coleta<\/a><br><a href=\"https:\/\/cursaueducacao.com.br\/\" target=\"_blank\" rel=\"noreferrer noopener\">Plataforma cursau<\/a> (com mais de 800H de conte\u00fado e grupo vip)<br>P\u00f3s gradua\u00e7\u00f5es: <a href=\"https:\/\/cursaueducacao.com.br\/pg\/pos-micro\/?micr_t4_utmsource=blog-cursau&amp;micr_t4_utmmedium=artigo&amp;micr_t4_utmcampaign=&amp;micr_t4_utmcontent=artigo&amp;micr_t4_utmterm=\" target=\"_blank\" rel=\"noreferrer noopener\">micro<\/a>, <a href=\"https:\/\/cursaueducacao.com.br\/pg\/pos-acml\/?acml_t4_utmsource=blog-cursau&amp;acml_t4_utmmedium=artigo&amp;acml_t4_utmcampaign=&amp;acml_t4_utmcontent=artigo&amp;acml_t4_utmterm=\" target=\"_blank\" rel=\"noreferrer noopener\">an\u00e1lises<\/a> e <a href=\"https:\/\/cursaueducacao.com.br\/pg\/pos-cfpc\/?cfpc_t1_utmsource=blog-cursau&amp;cfpc_t1_utmmedium=artigo&amp;cfpc_t1_utmcampaign=&amp;cfpc_t1_utmcontent=artigo&amp;cfpc_t1_utmterm=\" target=\"_blank\" rel=\"noreferrer noopener\">per\u00edcia<\/a><\/h4>\n\n\n\n<p><\/p>\n\n\n\n<p>Refer\u00eancia bibliogr\u00e1fica: <\/p>\n\n\n\n<p>&nbsp;<strong>NELSON, David L.; HOSKINS, Aaron A.; Cox, Michael M..<\/strong>&nbsp;<strong>Princ\u00edpios de Bioqu\u00edmica de Lehninger.<\/strong>&nbsp;<strong>8.<\/strong>&nbsp;<strong>ed Porto Alegre: Artmed, 2022, 1220<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea certamente j\u00e1 estudou sobre pH nas aulas de bioqu\u00edmica da faculdade. Mas voc\u00ea sabe a defini\u00e7\u00e3o desse conceito ou consegue explicar com suas palavras o que ele significa? Muitos alunos t\u00eam dificuldade, e \u00e9 por isso que hoje voc\u00ea vai entender de uma vez por todas essa defini\u00e7\u00e3o. Em suma, pH nada mais \u00e9 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1229,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,7],"tags":[157,217,47,168,170,194],"class_list":["post-1227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bioquimica","category-saude-basica","tag-biodepressina","tag-biomed","tag-biomedicina","tag-biomedico","tag-bioquimica","tag-cursau"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>O que \u00e9 pH? - Cursau Educa\u00e7\u00e3o - Blog<\/title>\n<meta name=\"description\" content=\"Mas afinal, voc\u00ea sabe explicar o que \u00e9 pH? N\u00e3o? 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