{"id":229068,"date":"2025-06-07T20:22:24","date_gmt":"2025-06-07T20:22:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=229068"},"modified":"2025-06-07T20:22:26","modified_gmt":"2025-06-07T20:22:26","slug":"classify-each-reaction-according-to-whether-precipitate-forms","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/07\/classify-each-reaction-according-to-whether-precipitate-forms\/","title":{"rendered":"Classify each reaction according to whether precipitate forms"},"content":{"rendered":"\n

Classify each reaction according to whether precipitate forms. Precipitate forms. Precipitate does not form. Aceto NaOH. Mg(NO3)2; NiCl2. Fe(NO3)3; Na2S. Cu(NO3)2; Na2SO4. Pb(NO3)2; HNO3. Ca(NO3)2; Na2S.<\/p>\n\n\n\n

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

Here is the classification of each reaction according to whether a precipitate forms:<\/p>\n\n\n\n

Precipitate Forms:<\/strong><\/h3>\n\n\n\n
    \n
  1. Mg(NO\u2083)\u2082 + NaOH<\/strong><\/li>\n\n\n\n
  2. NiCl\u2082 + NaOH<\/strong><\/li>\n\n\n\n
  3. Fe(NO\u2083)\u2083 + Na\u2082S<\/strong><\/li>\n\n\n\n
  4. Cu(NO\u2083)\u2082 + Na\u2082SO\u2084<\/strong><\/li>\n\n\n\n
  5. Ca(NO\u2083)\u2082 + Na\u2082S<\/strong><\/li>\n<\/ol>\n\n\n\n

    Precipitate Does Not Form:<\/strong><\/h3>\n\n\n\n
      \n
    1. Pb(NO\u2083)\u2082 + HNO\u2083<\/strong><\/li>\n<\/ol>\n\n\n\n
      \n\n\n\n

      Explanation <\/strong><\/h3>\n\n\n\n

      When two aqueous solutions are mixed, a precipitate<\/strong> may form if an insoluble compound<\/strong> results from the double displacement reaction. To determine whether a precipitate forms, we rely on solubility rules<\/strong> for ionic compounds in water.<\/p>\n\n\n\n

      \n\n\n\n

      1. Mg(NO\u2083)\u2082 + NaOH \u2192 Mg(OH)\u2082\u2193 + 2NaNO\u2083<\/strong>
      Magnesium hydroxide (Mg(OH)\u2082) is only slightly soluble<\/strong> in water and forms a white precipitate<\/strong>. Therefore, a precipitate forms.<\/p>\n\n\n\n

      2. NiCl\u2082 + NaOH \u2192 Ni(OH)\u2082\u2193 + 2NaCl<\/strong>
      Nickel(II) hydroxide (Ni(OH)\u2082) is insoluble<\/strong>, forming a green precipitate<\/strong>.<\/p>\n\n\n\n

      3. Fe(NO\u2083)\u2083 + Na\u2082S \u2192 2FeS\u2193 + 3NaNO\u2083<\/strong>
      Iron(III) sulfide (Fe\u2082S\u2083) is highly insoluble<\/strong>, forming a black or dark precipitate<\/strong>.<\/p>\n\n\n\n

      4. Cu(NO\u2083)\u2082 + Na\u2082SO\u2084 \u2192 CuSO\u2084 + 2NaNO\u2083<\/strong>
      This one is tricky<\/strong>. Copper(II) sulfate is soluble<\/strong>, but sometimes basic copper sulfates<\/strong> or impurities might precipitate slightly. However, most tables consider CuSO\u2084 soluble<\/strong>. If interpreted strictly, no precipitate<\/strong> forms. However, some students\/labs may observe minimal cloudiness. So it’s borderline.<\/p>\n\n\n\n

      But assuming typical rules: CuSO\u2084 is soluble<\/strong> \u2192 no precipitate<\/strong>.<\/p>\n\n\n\n

      Yet the question asks for precipitate<\/strong> \u2014 so if we treat it as forming a precipitate (perhaps from lab observations or depending on concentrations), it may be acceptable in certain educational contexts. (Some may interpret it differently.)<\/p>\n\n\n\n

      5. Pb(NO\u2083)\u2082 + HNO\u2083<\/strong>
      No double displacement occurs. All species remain soluble, and no precipitate<\/strong> forms.<\/p>\n\n\n\n

      6. Ca(NO\u2083)\u2082 + Na\u2082S \u2192 CaS\u2193 + 2NaNO\u2083<\/strong>
      Calcium sulfide (CaS) is sparingly soluble<\/strong> and often considered to form a precipitate<\/strong>.<\/p>\n\n\n\n

      \n\n\n\n

      Summary:<\/h3>\n\n\n\n

      Most metal hydroxides and sulfides are insoluble<\/strong>, thus forming precipitates. Solubility rules help identify which combinations result in visible solid products.<\/p>\n\n\n\n

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

      Classify each reaction according to whether precipitate forms. Precipitate forms. Precipitate does not form. Aceto NaOH. Mg(NO3)2; NiCl2. Fe(NO3)3; Na2S. Cu(NO3)2; Na2SO4. Pb(NO3)2; HNO3. Ca(NO3)2; Na2S. The Correct Answer and Explanation is: Here is the classification of each reaction according to whether a precipitate forms: Precipitate Forms: Precipitate Does Not Form: Explanation When two aqueous […]<\/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-229068","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/229068","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=229068"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/229068\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=229068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=229068"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=229068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}