{"id":162206,"date":"2024-11-06T10:56:12","date_gmt":"2024-11-06T10:56:12","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=162206"},"modified":"2024-11-06T10:56:15","modified_gmt":"2024-11-06T10:56:15","slug":"which-of-the-following-statements-is-true","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/11\/06\/which-of-the-following-statements-is-true\/","title":{"rendered":"Which of the following statements is true"},"content":{"rendered":"\n

Which of the following statements is true?
A) A buffer forms when any acid or base are mixed together
B) A buffer forms when a strong acid is mixed with a weak acid.
C) A buffer forms when a conjugate weak acid\/weak base pair are mixed together.
D) A buffer forms when a weak acid is mixed with a weak base.<\/p>\n\n\n\n

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

The correct answer is D) A buffer forms when a weak acid is mixed with a weak base.<\/strong><\/p>\n\n\n\n

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

A buffer<\/strong> is a solution that resists changes in pH when small amounts of acid or base are added. Buffers are typically made up of a weak acid and its conjugate base, or a weak base and its conjugate acid. These components work together to maintain the pH of a solution by neutralizing added acids or bases.<\/p>\n\n\n\n

In this case:<\/p>\n\n\n\n

    \n
  • Weak acid<\/strong>: A weak acid only partially dissociates in water. This means it does not release all of its hydrogen ions (H+) into the solution.<\/li>\n\n\n\n
  • Weak base<\/strong>: Similarly, a weak base only partially accepts hydrogen ions from the solution.<\/li>\n<\/ul>\n\n\n\n

    When a weak acid<\/strong> and a weak base<\/strong> are mixed together, they can interact in such a way that they form a buffer system<\/strong>. The weak acid can donate hydrogen ions (H+) when the pH increases (in the presence of a base), while the weak base can accept hydrogen ions when the pH decreases (in the presence of an acid). This buffering action helps to maintain a relatively stable pH in the solution.<\/p>\n\n\n\n

    Why the other options are incorrect:<\/h4>\n\n\n\n
      \n
    • A) A buffer forms when any acid or base are mixed together<\/strong>: This is incorrect because not all acids and bases form buffers. A buffer requires a specific pairing of a weak acid with its conjugate base, or a weak base with its conjugate acid. Strong acids or bases cannot form effective buffers because they dissociate completely in water.<\/li>\n\n\n\n
    • B) A buffer forms when a strong acid is mixed with a weak acid<\/strong>: This is incorrect because mixing a strong acid with a weak acid does not create a buffer. The strong acid would dominate, dissociating completely and significantly lowering the pH, not allowing the weak acid to function in a buffering capacity.<\/li>\n\n\n\n
    • C) A buffer forms when a conjugate weak acid\/weak base pair are mixed together<\/strong>: This is close, but the correct terminology should involve either a weak acid and its conjugate base or a weak base and its conjugate acid. A conjugate acid\/base pair from two weak components will create a buffer, but both must be weak acid\/base pairs, not just weak components alone.<\/li>\n<\/ul>\n\n\n\n

      Therefore, the correct and complete definition of a buffer system involves mixing a weak acid<\/strong> with a weak base<\/strong>, which allows for a dynamic equilibrium that resists pH changes.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Which of the following statements is true?A) A buffer forms when any acid or base are mixed togetherB) A buffer forms when a strong acid is mixed with a weak acid.C) A buffer forms when a conjugate weak acid\/weak base pair are mixed together.D) A buffer forms when a weak acid is mixed with a […]<\/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-162206","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/162206","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=162206"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/162206\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=162206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=162206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=162206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}