{"id":1420,"date":"2026-05-12T21:47:48","date_gmt":"2026-05-12T21:47:48","guid":{"rendered":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/solution-exercise-20\/"},"modified":"2026-05-13T03:39:35","modified_gmt":"2026-05-13T03:39:35","slug":"solution-exercise-20","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/solution-exercise-20\/","title":{"raw":"Solution Exercise 20","rendered":"Solution Exercise 20"},"content":{"raw":"
\r\n
\r\n
The following table contains the results of an analysis of a water sample with the concentrations of various ions (column A) given in milligrams per liter (mg\/L) in column B.<\/blockquote>\r\n<\/div>\r\n
    \r\n \t
  1. For column C: The atomic weight is the number at the bottom of each element cell in the interactive periodic table provided by the link; e.g., the number indicated by the red polygon on the entry for calcium provided here.<\/li>\r\n<\/ol>\r\n
    \r\n
    \"\"<\/blockquote>\r\n<\/div>\r\n
      \r\n \t
    1. For column D: Divide the concentration in mg\/L by the atomic weight of each ion to convert the concentration from mg\/L to molarity (mmol\/L).<\/li>\r\n \t
    2. For column E: Enter the valence charge for each ion.<\/li>\r\n \t
    3. For column F: Multiply the molarity by the valence charge to calculate the concentration in milliequivalents per liter (meq\/L)<\/li>\r\n<\/ol>\r\n<\/colgroup>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
      A<\/strong><\/td>\r\nB<\/strong><\/td>\r\nC<\/strong><\/td>\r\nD<\/strong><\/td>\r\nE<\/strong><\/td>\r\nF<\/strong><\/td>\r\n<\/tr>\r\n
      Solute<\/strong><\/td>\r\nMeasured Concentration (mg\/L)<\/strong><\/td>\r\nAtomic weight(g)<\/strong><\/td>\r\nMolarity (mmol\/L)<\/strong><\/td>\r\nValence (charge)<\/strong><\/td>\r\nmeq\/L<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{Ca}_{}^{2 +}[\/latex]<\/td>\r\n92<\/td>\r\n40.08<\/strong><\/td>\r\n2.30<\/strong><\/td>\r\n2<\/strong><\/td>\r\n4.59<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{Mg}_{}^{2 +}[\/latex]<\/td>\r\n34<\/td>\r\n24.31<\/strong><\/td>\r\n1.40<\/strong><\/td>\r\n2<\/strong><\/td>\r\n2.80<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{Na}_{}^{+}[\/latex]<\/td>\r\n8.2<\/td>\r\n23.00<\/strong><\/td>\r\n0.36<\/strong><\/td>\r\n1<\/strong><\/td>\r\n0.36<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]K_{}^{+}[\/latex]<\/td>\r\n1.4<\/td>\r\n39.10<\/strong><\/td>\r\n0.036<\/strong><\/td>\r\n1<\/strong><\/td>\r\n0.036<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{Fe(III)}_{}^{}[\/latex]<\/td>\r\n0.1<\/td>\r\n55.80<\/strong><\/td>\r\n0.02<\/strong><\/td>\r\n3<\/strong><\/td>\r\n0.005<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{HCO}_{3}^{-}[\/latex]<\/td>\r\n325<\/td>\r\n61.00<\/strong><\/td>\r\n5.33<\/strong><\/td>\r\n1<\/strong><\/td>\r\n5.33<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{SO}_{4}^{2 -}[\/latex]<\/td>\r\n84<\/td>\r\n96.00<\/strong><\/td>\r\n0.88<\/strong><\/td>\r\n2<\/strong><\/td>\r\n1.75<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{Cl}_{}^{-}[\/latex]<\/td>\r\n9.6<\/td>\r\n35.50<\/strong><\/td>\r\n0.27<\/strong><\/td>\r\n1<\/strong><\/td>\r\n0.27<\/strong><\/td>\r\n<\/tr>\r\n
      [latex]{NO}_{3}^{-}[\/latex]<\/td>\r\n13<\/td>\r\n62.00<\/strong><\/td>\r\n0.21<\/strong><\/td>\r\n1<\/strong><\/td>\r\n0.21<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
      \r\n\r\nReturn to Exercise 20<\/strong><\/span><\/a>\u2ba5\r\n\r\n<\/div>\r\n
      \r\n\r\nReturn to where text linked to Exercise 20<\/strong><\/span><\/a>\u2ba5\r\n\r\n<\/div>\r\n<\/div>","rendered":"
      \n
      \n

      The following table contains the results of an analysis of a water sample with the concentrations of various ions (column A) given in milligrams per liter (mg\/L) in column B.<\/p><\/blockquote>\n<\/div>\n

        \n
      1. For column C: The atomic weight is the number at the bottom of each element cell in the interactive periodic table provided by the link; e.g., the number indicated by the red polygon on the entry for calcium provided here.<\/li>\n<\/ol>\n
        \n

        \"\"<\/p><\/blockquote>\n<\/div>\n

          \n
        1. For column D: Divide the concentration in mg\/L by the atomic weight of each ion to convert the concentration from mg\/L to molarity (mmol\/L).<\/li>\n
        2. For column E: Enter the valence charge for each ion.<\/li>\n
        3. For column F: Multiply the molarity by the valence charge to calculate the concentration in milliequivalents per liter (meq\/L)<\/li>\n<\/ol>\n\n\n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n\n\n
          A<\/strong><\/td>\nB<\/strong><\/td>\nC<\/strong><\/td>\nD<\/strong><\/td>\nE<\/strong><\/td>\nF<\/strong><\/td>\n<\/tr>\n
          Solute<\/strong><\/td>\nMeasured Concentration (mg\/L)<\/strong><\/td>\nAtomic weight(g)<\/strong><\/td>\nMolarity (mmol\/L)<\/strong><\/td>\nValence (charge)<\/strong><\/td>\nmeq\/L<\/strong><\/td>\n<\/tr>\n
          [latex]{Ca}_{}^{2 +}[\/latex]<\/td>\n92<\/td>\n40.08<\/strong><\/td>\n2.30<\/strong><\/td>\n2<\/strong><\/td>\n4.59<\/strong><\/td>\n<\/tr>\n
          [latex]{Mg}_{}^{2 +}[\/latex]<\/td>\n34<\/td>\n24.31<\/strong><\/td>\n1.40<\/strong><\/td>\n2<\/strong><\/td>\n2.80<\/strong><\/td>\n<\/tr>\n
          [latex]{Na}_{}^{+}[\/latex]<\/td>\n8.2<\/td>\n23.00<\/strong><\/td>\n0.36<\/strong><\/td>\n1<\/strong><\/td>\n0.36<\/strong><\/td>\n<\/tr>\n
          [latex]K_{}^{+}[\/latex]<\/td>\n1.4<\/td>\n39.10<\/strong><\/td>\n0.036<\/strong><\/td>\n1<\/strong><\/td>\n0.036<\/strong><\/td>\n<\/tr>\n
          [latex]{Fe(III)}_{}^{}[\/latex]<\/td>\n0.1<\/td>\n55.80<\/strong><\/td>\n0.02<\/strong><\/td>\n3<\/strong><\/td>\n0.005<\/strong><\/td>\n<\/tr>\n
          [latex]{HCO}_{3}^{-}[\/latex]<\/td>\n325<\/td>\n61.00<\/strong><\/td>\n5.33<\/strong><\/td>\n1<\/strong><\/td>\n5.33<\/strong><\/td>\n<\/tr>\n
          [latex]{SO}_{4}^{2 -}[\/latex]<\/td>\n84<\/td>\n96.00<\/strong><\/td>\n0.88<\/strong><\/td>\n2<\/strong><\/td>\n1.75<\/strong><\/td>\n<\/tr>\n
          [latex]{Cl}_{}^{-}[\/latex]<\/td>\n9.6<\/td>\n35.50<\/strong><\/td>\n0.27<\/strong><\/td>\n1<\/strong><\/td>\n0.27<\/strong><\/td>\n<\/tr>\n
          [latex]{NO}_{3}^{-}[\/latex]<\/td>\n13<\/td>\n62.00<\/strong><\/td>\n0.21<\/strong><\/td>\n1<\/strong><\/td>\n0.21<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
          \n

          Return to Exercise 20<\/strong><\/span><\/a>\u2ba5<\/p>\n<\/div>\n

          \n

          Return to where text linked to Exercise 20<\/strong><\/span><\/a>\u2ba5<\/p>\n<\/div>\n<\/div>\n","protected":false},"author":8,"menu_order":131,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1420","chapter","type-chapter","status-publish","hentry"],"part":1531,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1420","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/users\/8"}],"version-history":[{"count":2,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1420\/revisions"}],"predecessor-version":[{"id":1838,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1420\/revisions\/1838"}],"part":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/parts\/1531"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1420\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/media?parent=1420"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapter-type?post=1420"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/contributor?post=1420"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/license?post=1420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}