{"id":252748,"date":"2025-07-11T12:12:42","date_gmt":"2025-07-11T12:12:42","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=252748"},"modified":"2025-07-11T12:12:44","modified_gmt":"2025-07-11T12:12:44","slug":"if-the-kb-of-a-certain-aromatic-amine-is-2-24-x-10-9-then-what-is-the-value-of-pkb","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/11\/if-the-kb-of-a-certain-aromatic-amine-is-2-24-x-10-9-then-what-is-the-value-of-pkb\/","title":{"rendered":"If the Kb of a certain aromatic amine is 2.24 \u00d7 10\u20139, then what is the value of pKb"},"content":{"rendered":"\n<p>If the Kb of a certain aromatic amine is 2.24 \u00d7 10\u20139, then what is the value of pKb? <\/p>\n\n\n\n<p>options: a) 9.22 b) \u22129.22 c) \u22128.65 d) 8.65<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>d) 8.65<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The pKb is calculated from the Kb of a base using the formula: pKb=\u2212log\u2061(Kb)pKb = -\\log(Kb)<\/p>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kb<\/strong> is the base dissociation constant.<\/li>\n\n\n\n<li><strong>pKb<\/strong> is the negative logarithm (base 10) of the Kb.<\/li>\n<\/ul>\n\n\n\n<p>Given that the <strong>Kb<\/strong> of the aromatic amine is 2.24\u00d710\u221292.24 \\times 10^{-9}, we can calculate the pKb as follows: pKb=\u2212log\u2061(2.24\u00d710\u22129)pKb = -\\log(2.24 \\times 10^{-9})<\/p>\n\n\n\n<p>To break this down:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>First, apply the logarithmic properties to simplify the expression: log\u2061(2.24\u00d710\u22129)=log\u2061(2.24)+log\u2061(10\u22129)\\log(2.24 \\times 10^{-9}) = \\log(2.24) + \\log(10^{-9})<\/li>\n\n\n\n<li>The logarithm of 10\u2212910^{-9} is: log\u2061(10\u22129)=\u22129\\log(10^{-9}) = -9<\/li>\n\n\n\n<li>Now calculate log\u2061(2.24)\\log(2.24). Using a calculator: log\u2061(2.24)\u22480.350\\log(2.24) \\approx 0.350<\/li>\n\n\n\n<li>Adding these together: log\u2061(2.24\u00d710\u22129)=0.350+(\u22129)=\u22128.65\\log(2.24 \\times 10^{-9}) = 0.350 + (-9) = -8.65<\/li>\n\n\n\n<li>Therefore: pKb=\u2212(\u22128.65)=8.65pKb = -(-8.65) = 8.65<\/li>\n<\/ol>\n\n\n\n<p>Thus, the <strong>pKb<\/strong> of the aromatic amine is <strong>8.65<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Concept:<\/h3>\n\n\n\n<p>The pKb is a measure of the basicity of a compound. The lower the pKb, the stronger the base. In this case, since the Kb is quite small (2.24 \u00d7 10\u20139), the pKb value indicates that the aromatic amine is a weak base.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If the Kb of a certain aromatic amine is 2.24 \u00d7 10\u20139, then what is the value of pKb? options: a) 9.22 b) \u22129.22 c) \u22128.65 d) 8.65 The correct answer and explanation is: The correct answer is d) 8.65. Explanation: The pKb is calculated from the Kb of a base using the formula: pKb=\u2212log\u2061(Kb)pKb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-252748","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=252748"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252748\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=252748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=252748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=252748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}