{"id":187588,"date":"2025-02-05T06:23:01","date_gmt":"2025-02-05T06:23:01","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=187588"},"modified":"2025-02-05T06:23:03","modified_gmt":"2025-02-05T06:23:03","slug":"consider-the-following-data-on-some-weak-acids-and-weak-bases","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/05\/consider-the-following-data-on-some-weak-acids-and-weak-bases\/","title":{"rendered":"Consider the following data on some weak acids and weak bases"},"content":{"rendered":"\n

Consider the following data on some weak acids and weak bases acid base formula formula methylamine CH2NH hydroxylamine HONH name name hypochlorous acid HCIO 3.0x 108 hydrofluoric acidHF 6.8 x 10 | 1,1 \u00d7 10 Use this data to rank the following solutions in order of increasing pH. In other words, select a ‘1’ next to the solution that will have the lowest pH, a ‘2’ next to the solution that will have the next lowest pH, and so on solution pH 0.1 M KF choose one 0.1 M NaCIO choose one 0.1 M HONH3Br choose one 0.1 M KCI choose one<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

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

To rank the solutions in order of increasing pH, we analyze the effect of each salt on the pH of the solution.<\/p>\n\n\n\n

Step 1: Understanding Each Salt<\/strong><\/h3>\n\n\n\n

Each salt will either be neutral, acidic, or basic based on the nature of its conjugate acid\/base.<\/p>\n\n\n\n

    \n
  1. 0.1 M KF (Potassium Fluoride)<\/strong><\/li>\n<\/ol>\n\n\n\n
      \n
    • KF is the salt of a weak acid (HF) and a strong base (KOH).<\/li>\n\n\n\n
    • Fluoride (F\u207b) is the conjugate base of hydrofluoric acid (HF), which has a Ka = 6.8 \u00d7 10\u207b\u2074<\/strong>.<\/li>\n\n\n\n
    • Since HF is a weak acid, its conjugate base (F\u207b) hydrolyzes in water, increasing the pH.<\/li>\n\n\n\n
    • The solution is basic<\/strong>.<\/li>\n<\/ul>\n\n\n\n
        \n
      1. 0.1 M NaClO (Sodium Hypochlorite)<\/strong><\/li>\n<\/ol>\n\n\n\n
          \n
        • NaClO is the salt of hypochlorous acid (HClO) and a strong base (NaOH).<\/li>\n\n\n\n
        • Hypochlorite (ClO\u207b) is the conjugate base of hypochlorous acid (HClO), which has a Ka = 3.0 \u00d7 10\u207b\u2078<\/strong>.<\/li>\n\n\n\n
        • Since HClO is a very weak acid, ClO\u207b strongly hydrolyzes, making the solution basic<\/strong> (more basic than KF).<\/li>\n<\/ul>\n\n\n\n
            \n
          1. 0.1 M HONH\u2083Br (Hydroxylammonium Bromide)<\/strong><\/li>\n<\/ol>\n\n\n\n
              \n
            • HONH\u2083Br comes from hydroxylamine (HONH\u2082), a weak base (Kb = 1.1 \u00d7 10\u207b\u2078<\/strong>).<\/li>\n\n\n\n
            • HONH\u2083\u207a is the conjugate acid of HONH\u2082 and hydrolyzes in water, releasing H\u207a, making the solution acidic<\/strong>.<\/li>\n<\/ul>\n\n\n\n
                \n
              1. 0.1 M KCl (Potassium Chloride)<\/strong><\/li>\n<\/ol>\n\n\n\n
                  \n
                • KCl is a salt of a strong acid (HCl) and a strong base (KOH).<\/li>\n\n\n\n
                • Neither K\u207a nor Cl\u207b hydrolyzes in water, so the solution is neutral<\/strong> (pH = 7).<\/li>\n<\/ul>\n\n\n\n

                  Step 2: Ranking in Increasing pH Order<\/strong><\/h3>\n\n\n\n
                    \n
                  1. 0.1 M HONH\u2083Br<\/strong> (Acidic, lowest pH) \u2192 Rank 1<\/strong><\/li>\n\n\n\n
                  2. 0.1 M KCl<\/strong> (Neutral, pH \u2248 7) \u2192 Rank 2<\/strong><\/li>\n\n\n\n
                  3. 0.1 M KF<\/strong> (Weakly basic, slightly above 7) \u2192 Rank 3<\/strong><\/li>\n\n\n\n
                  4. 0.1 M NaClO<\/strong> (More basic due to weak acid conjugate, highest pH) \u2192 Rank 4<\/strong><\/li>\n<\/ol>\n\n\n\n

                    Final Ranking:<\/strong><\/h3>\n\n\n\n
                      \n
                    • 0.1 M HONH\u2083Br \u2192 1 (lowest pH, acidic)<\/strong><\/li>\n\n\n\n
                    • 0.1 M KCl \u2192 2 (neutral)<\/strong><\/li>\n\n\n\n
                    • 0.1 M KF \u2192 3 (slightly basic)<\/strong><\/li>\n\n\n\n
                    • 0.1 M NaClO \u2192 4 (most basic, highest pH)<\/strong><\/li>\n<\/ul>\n\n\n\n

                      Thus, the correct order from lowest to highest pH is:
                      HONH\u2083Br < KCl < KF < NaClO<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

                      Consider the following data on some weak acids and weak bases acid base formula formula methylamine CH2NH hydroxylamine HONH name name hypochlorous acid HCIO 3.0x 108 hydrofluoric acidHF 6.8 x 10 | 1,1 \u00d7 10 Use this data to rank the following solutions in order of increasing pH. In other words, select a ‘1’ next […]<\/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-187588","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/187588","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=187588"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/187588\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=187588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=187588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=187588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}