{"id":206002,"date":"2025-03-26T06:48:03","date_gmt":"2025-03-26T06:48:03","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206002"},"modified":"2025-03-26T06:48:06","modified_gmt":"2025-03-26T06:48:06","slug":"which-of-the-following-is-the-strongest-acid-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/26\/which-of-the-following-is-the-strongest-acid-2\/","title":{"rendered":"\u00a0Which of the following is the strongest acid"},"content":{"rendered":"\n

 Which of the following is the strongest acid?<\/p>\n\n\n\n

A) H3PO4<\/p>\n\n\n\n

B) NH4+<\/p>\n\n\n\n

C) NaOH<\/p>\n\n\n\n

D) H2CO3<\/p>\n\n\n\n

E) HCl<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

The correct answer is E) HCl (Hydrochloric acid)<\/strong>.<\/p>\n\n\n\n

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

Acidity is determined by the ability of a substance to donate protons (H\u207a ions<\/strong>) in solution. This strength is measured using the acid dissociation constant (Ka)<\/strong> or pKa<\/strong> values. Strong acids have high Ka values and low pKa values. Let\u2019s analyze each option:<\/p>\n\n\n\n

    \n
  1. H\u2083PO\u2084 (Phosphoric acid)<\/strong>\n
      \n
    • A moderately strong acid<\/strong> but not fully dissociated in water.<\/li>\n\n\n\n
    • It has a pKa of 2.12<\/strong> for its first dissociation, meaning it’s weaker than HCl.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • NH\u2084\u207a (Ammonium ion)<\/strong>\n
        \n
      • A weak acid<\/strong>, formed from NH\u2083 (ammonia) reacting with H\u207a.<\/li>\n\n\n\n
      • Has a pKa of 9.25<\/strong>, meaning it is much weaker than HCl.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • NaOH (Sodium hydroxide)<\/strong>\n
          \n
        • Not an acid<\/strong>, but a strong base<\/strong> that dissociates completely into Na\u207a and OH\u207b in solution.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • H\u2082CO\u2083 (Carbonic acid)<\/strong>\n
            \n
          • A weak acid<\/strong>, with a pKa of 6.35<\/strong> for the first dissociation.<\/li>\n\n\n\n
          • It does not fully dissociate in water.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • HCl (Hydrochloric acid) – Strongest Acid<\/strong>\n
              \n
            • A strong acid<\/strong>, meaning it completely ionizes<\/strong> in water: HCl\u2192H++Cl\u2212HCl \\rightarrow H^+ + Cl^-<\/li>\n\n\n\n
            • Has a pKa of approximately -6.3<\/strong>, making it much stronger than all the other acids listed.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

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

              HCl is the strongest acid<\/strong> among the given choices because it fully dissociates in water, releasing maximum H\u207a ions<\/strong> and having a very low pKa value<\/strong>.<\/p>\n\n\n\n

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

               Which of the following is the strongest acid? A) H3PO4 B) NH4+ C) NaOH D) H2CO3 E) HCl The correct answer and explanation is : The correct answer is E) HCl (Hydrochloric acid). Explanation: Acidity is determined by the ability of a substance to donate protons (H\u207a ions) in solution. This strength is measured using […]<\/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-206002","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206002","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=206002"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206002\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}