The weakest acid among the given choices is H3BO3 (boric acid)<\/strong> because it has the smallest acid dissociation constant (Ka = 5.4 \u00d7 10\u207b\u00b9\u2070<\/strong>).<\/p>\n\n\n\n The strength of an acid is determined by its Ka<\/strong> value\u2014the higher the Ka<\/strong>, the stronger the acid, since it indicates a greater extent of ionization in solution. Conversely, a smaller Ka<\/strong> value means the acid ionizes less in water, making it a weaker acid.<\/p>\n\n\n\n Let\u2019s compare the Ka<\/strong> values of the given acids:<\/p>\n\n\n\n Unlike the other acids that donate protons (H\u207a)<\/strong> directly, boric acid does not act as a traditional Br\u00f8nsted-Lowry acid<\/strong>. Instead, it behaves as a Lewis acid<\/strong>, reacting with water to form the complex ion [B(OH)\u2084]\u207b<\/strong> while releasing H\u207a indirectly<\/strong>:<\/p>\n\n\n\n [ Since this process is less efficient in releasing H\u207a<\/strong>, boric acid has a very low Ka<\/strong>, making it the weakest acid in this list.<\/p>\n\n\n\n D) H\u2083BO\u2083 (boric acid)<\/strong><\/p>\n\n\n\n Which of the following is the weakest acid? A) HF (Ka for HF is 7.2 \u00d7 10-4) B) HCN (Ka for HCN is 4.9 \u00d7 10-10) C) HCNO (Ka for HCNO is 2 \u00d7 10-4) D) H3BO3 (Ka for H3BO3 is 5.4 \u00d7 10-10) The correct answer and explanation is : The weakest acid among […]<\/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-206008","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206008","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=206008"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206008\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation:<\/h3>\n\n\n\n
\n
Why is H\u2083BO\u2083<\/strong> the weakest?<\/h3>\n\n\n\n
H_3BO_3 + H_2O \\rightleftharpoons [B(OH)_4]^- + H^+
]<\/p>\n\n\n\nCorrect Answer:<\/strong><\/h3>\n\n\n\n
![\"\"](\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/03\/image-1484.png\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"