{"id":134299,"date":"2024-08-29T18:29:36","date_gmt":"2024-08-29T18:29:36","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=134299"},"modified":"2024-08-29T18:29:39","modified_gmt":"2024-08-29T18:29:39","slug":"what-solution-has-a-ph-of-7","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/08\/29\/what-solution-has-a-ph-of-7\/","title":{"rendered":"What solution has a pH of 7?"},"content":{"rendered":"\n<p>What solution has a pH of 7?<\/p>\n\n\n\n<p>A.<br>Aniline<\/p>\n\n\n\n<p>B.<br>Pyridine<\/p>\n\n\n\n<p>C.<br>Pure water<\/p>\n\n\n\n<p>D.<br>Sodium hydroxid<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The Correct answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>C. Pure water<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The pH scale is a measure of the hydrogen ion concentration in a solution, ranging from 0 to 14. A pH of 7 is considered neutral, meaning the concentration of hydrogen ions (H\u207a) equals the concentration of hydroxide ions (OH\u207b) in the solution.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Pure Water<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Pure water has a neutral pH of 7 at 25\u00b0C (77\u00b0F). This neutrality is due to the fact that water dissociates into hydrogen ions (H\u207a) and hydroxide ions (OH\u207b) in equal amounts. The equilibrium constant for the dissociation of water is Kw=[H+][OH\u2212]=1.0\u00d710\u221214K_w = [H^+][OH^-] = 1.0 \\times 10^{-14}Kw\u200b=[H+][OH\u2212]=1.0\u00d710\u221214, leading to equal concentrations of [H+][H^+][H+] and [OH\u2212][OH^-][OH\u2212], both being 1.0\u00d710\u221271.0 \\times 10^{-7}1.0\u00d710\u22127 M. Therefore, the pH is 7, which is neutral.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Aniline<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Aniline is a weak base with a pH typically higher than 7. Aniline (C\u2086H\u2085NH\u2082) reacts with water to form aniline hydrochloride and hydroxide ions, increasing the pH of the solution. Thus, aniline does not have a neutral pH.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pyridine<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Pyridine is also a weak base. It reacts with water to form pyridinium ions and hydroxide ions, which results in a basic solution with a pH greater than 7. Therefore, pyridine solutions are not neutral.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Sodium Hydroxide (NaOH)<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Sodium hydroxide is a strong base that dissociates completely in water to produce hydroxide ions. This leads to a basic solution with a pH well above 7, often much higher depending on the concentration.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>In summary, among the options given, pure water is the only substance with a neutral pH of 7. Aniline, pyridine, and sodium hydroxide all result in basic solutions with pH values greater than 7.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What solution has a pH of 7? A.Aniline B.Pyridine C.Pure water D.Sodium hydroxid The Correct answer and Explanation is: The correct answer is C. Pure water. Explanation: The pH scale is a measure of the hydrogen ion concentration in a solution, ranging from 0 to 14. A pH of 7 is considered neutral, meaning the [&hellip;]<\/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-134299","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/134299","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=134299"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/134299\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=134299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=134299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=134299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}