{"id":257493,"date":"2025-07-17T13:45:23","date_gmt":"2025-07-17T13:45:23","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=257493"},"modified":"2025-07-17T13:45:26","modified_gmt":"2025-07-17T13:45:26","slug":"which-of-the-following-is-a-bronsted-lowry-base-but-not-an-arrhenius-base","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/17\/which-of-the-following-is-a-bronsted-lowry-base-but-not-an-arrhenius-base\/","title":{"rendered":"Which of the following is a Bronsted-Lowry base but NOT an Arrhenius base"},"content":{"rendered":"\n

Which of the following is a Bronsted-Lowry base but NOT an Arrhenius base? NaOH NH3 KOH HC<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The correct answer is NH\u2083 (ammonia)<\/strong>.<\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

To understand why ammonia (NH\u2083) is a Br\u00f8nsted-Lowry base<\/strong> but not an Arrhenius base<\/strong>, we need to consider the definitions of both theories:<\/p>\n\n\n\n

    \n
  1. Arrhenius Definition<\/strong>:\n
      \n
    • An Arrhenius base is a substance that, when dissolved in water, increases the concentration of hydroxide ions (OH\u207b).<\/li>\n\n\n\n
    • For example, NaOH and KOH are both Arrhenius bases because they dissociate in water to form OH\u207b ions.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Br\u00f8nsted-Lowry Definition<\/strong>:\n
        \n
      • A Br\u00f8nsted-Lowry base is a substance that accepts protons (H\u207a).<\/li>\n\n\n\n
      • Ammonia (NH\u2083) fits this definition because it can accept a proton to form ammonium ion (NH\u2084\u207a). This is shown by the reaction: NH3+H+\u27f6NH4+\\mathrm{NH}_3 + \\mathrm{H}^+ \\longrightarrow \\mathrm{NH}_4^+NH3\u200b+H+\u27f6NH4+\u200b<\/li>\n\n\n\n
      • Even though ammonia doesn\u2019t produce OH\u207b ions directly in water, it still behaves as a base by accepting a proton (H\u207a), which makes it a Br\u00f8nsted-Lowry base.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

        Why is NH\u2083 not an Arrhenius base<\/strong>?<\/h3>\n\n\n\n
          \n
        • NH\u2083 does not directly increase the concentration of OH\u207b ions in solution. Instead, it reacts with water molecules to produce OH\u207b ions through a different mechanism, as shown in the following equation: NH3+H2O\u21ccNH4++OH\u2212\\mathrm{NH}_3 + \\mathrm{H}_2\\mathrm{O} \\rightleftharpoons \\mathrm{NH}_4^+ + \\mathrm{OH}^-NH3\u200b+H2\u200bO\u21ccNH4+\u200b+OH\u2212<\/li>\n\n\n\n
        • Therefore, while ammonia leads to the formation of OH\u207b ions in solution, it doesn\u2019t do so by directly releasing them like NaOH or KOH. Thus, it doesn\u2019t fit the stricter Arrhenius definition.<\/li>\n<\/ul>\n\n\n\n

          Conclusion:<\/h3>\n\n\n\n

          Ammonia is a Br\u00f8nsted-Lowry base<\/strong> because it accepts protons, but it is not an Arrhenius base<\/strong> because it does not directly increase the concentration of OH\u207b ions in water.<\/p>\n\n\n\n

          \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

          Which of the following is a Bronsted-Lowry base but NOT an Arrhenius base? NaOH NH3 KOH HC The Correct Answer and Explanation is: The correct answer is NH\u2083 (ammonia). Explanation: To understand why ammonia (NH\u2083) is a Br\u00f8nsted-Lowry base but not an Arrhenius base, we need to consider the definitions of both theories: Why is […]<\/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-257493","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/257493","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=257493"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/257493\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=257493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=257493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=257493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}