{"id":9517,"date":"2023-10-24T13:55:17","date_gmt":"2023-10-24T11:55:17","guid":{"rendered":"https:\/\/www.em-grade.com\/non-categorizzato\/definition-of-ph-ka-and-pka\/"},"modified":"2023-10-24T13:55:17","modified_gmt":"2023-10-24T11:55:17","slug":"definition-of-ph-ka-and-pka","status":"publish","type":"post","link":"https:\/\/www.em-grade.com\/it\/chemistry-definitions-it\/definition-of-ph-ka-and-pka\/","title":{"rendered":"Definition of pH, Ka and Pka"},"content":{"rendered":"<h3><strong>D\u00e9finition of pKa<\/strong><\/h3>\n<p>From the Ka we define the pKa which is written <strong>pKa = &#8211; log Ka<\/strong><\/p>\n<p><a href=\"https:\/\/www.lachimie.fr\/solutions\/phmetrie\/table-pKa.php\">Pka<\/a> is generally used rather than Ka to determine the strength of an acid.<br \/>\nWe notice that the stronger the acid the smaller the pKa. Indeed, if it is strongly dissociated, the concentration [AH] becomes low.<\/p>\n<p>The relation becomes by introducing the logarithms in the relation of Ka :<br \/>\n-log [Ka] = &#8211; log [H<sup>+<\/sup>] &#8211; log[A<sup>&#8211;<\/sup>]\/[AH] \u2192 pKa = pH &#8211; log[A<sup>&#8211;<\/sup>]\/[AH]\ntherefore the definition of the pH as a function of the pKa :<br \/>\npH = pKa + log[A<sup>&#8211;<\/sup>]\/[AH]\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9finition of pKa From the Ka we define the pKa which is written pKa = &#8211; log Ka Pka is generally used rather than Ka to determine the strength of&#8230;<\/p>\n","protected":false},"author":8,"featured_media":9518,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"itsec_x_frame_options":"","footnotes":""},"categories":[784],"tags":[],"class_list":["post-9517","post","type-post","status-publish","format-standard","has-post-thumbnail","category-chemistry-definitions-it"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/posts\/9517","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/comments?post=9517"}],"version-history":[{"count":0,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/posts\/9517\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/media\/9518"}],"wp:attachment":[{"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/media?parent=9517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/categories?post=9517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.em-grade.com\/it\/wp-json\/wp\/v2\/tags?post=9517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}