Guess how many water molecules self-ionize in one liter of water! a) 7 moles b) 1 mole c) 10,000,000 moles d) 0.0000001 moles\u200b<\/p>\n\n\n\n
The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n The correct answer is d) 0.0000001 moles<\/strong>.<\/p>\n\n\n\n Water self-ionizes, meaning that a small number of water molecules dissociate into hydrogen ions (H\u207a) and hydroxide ions (OH\u207b) at any given time. This process is a reversible reaction represented by the equation:<\/p>\n\n\n\n [ At 25\u00b0C, the equilibrium concentration of hydrogen ions (H\u207a) or hydroxide ions (OH\u207b) in pure water is 1 \u00d7 10\u207b\u2077 moles per liter. This corresponds to a very small fraction of the total water molecules present.<\/p>\n\n\n\n A mole is defined as (6.022 \\times 10^{23}) molecules. In one liter of water, there are approximately:<\/p>\n\n\n\n [ This is because the molar mass of water is about 18.015 g\/mol, and 1 liter of water weighs approximately 1000 grams, so:<\/p>\n\n\n\n [ For the self-ionization, the concentration of ions is (1 \\times 10^{-7} \\, \\text{moles\/L}). Thus, in one liter of water, the number of ions produced by self-ionization would be:<\/p>\n\n\n\n [ This is equivalent to 0.0000001 moles of ions. Given that the self-ionization is a rare event compared to the total number of water molecules, this concentration is extremely low, explaining why the correct answer is d) 0.0000001 moles<\/strong>. The ionization is balanced in water, with equal amounts of hydrogen and hydroxide ions produced, maintaining the neutral nature of pure water.<\/p>\n","protected":false},"excerpt":{"rendered":" Guess how many water molecules self-ionize in one liter of water! a) 7 moles b) 1 mole c) 10,000,000 moles d) 0.0000001 moles\u200b The Correct Answer and Explanation is : The correct answer is d) 0.0000001 moles. Water self-ionizes, meaning that a small number of water molecules dissociate into hydrogen ions (H\u207a) and hydroxide ions […]<\/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-170028","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/170028","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=170028"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/170028\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=170028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=170028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=170028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
2H_2O \\rightleftharpoons H_3O^+ + OH^-
]<\/p>\n\n\n\nCalculation:<\/h3>\n\n\n\n
55.5 \\, \\text{moles of H}_2O
]<\/p>\n\n\n\n
\\frac{1000 \\, \\text{grams}}{18.015 \\, \\text{g\/mol}} \\approx 55.5 \\, \\text{moles of H}_2O
]<\/p>\n\n\n\n
1 \\times 10^{-7} \\, \\text{moles\/L} \\times 1 \\, \\text{L} = 1 \\times 10^{-7} \\, \\text{moles of H}^+ \\text{ and OH}^-
]<\/p>\n\n\n\n