{"id":1370,"date":"2026-05-12T21:47:41","date_gmt":"2026-05-12T21:47:41","guid":{"rendered":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/exercise-20\/"},"modified":"2026-05-13T03:35:32","modified_gmt":"2026-05-13T03:35:32","slug":"exercise-20","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/exercise-20\/","title":{"raw":"Exercise 20","rendered":"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. Use the periodic table at https:\/\/ptable.com\/#Properties<\/span><\/a>\u2197 to determine the atomic weight of each ion and enter the atomic weights in column C.<\/li>\r\n \t
  2. Use the atomic weight of each ion to convert the concentration from mg\/L to molarity (mmol\/L) and enter the answers in column D.<\/li>\r\n \t
  3. Enter the valence charge for each ion in column E.<\/li>\r\n \t
  4. Use the valence charge and values from column D 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\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{Mg}_{}^{2 +}[\/latex]<\/td>\r\n34<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{Na}_{}^{+}[\/latex]<\/td>\r\n8.2<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]K_{}^{+}[\/latex]<\/td>\r\n1.4<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{Fe(III)}_{}^{}[\/latex]<\/td>\r\n0.1<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{HCO}_{3}^{-}[\/latex]<\/td>\r\n325<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{SO}_{4}^{2 -}[\/latex]<\/td>\r\n84<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{Cl}_{}^{-}[\/latex]<\/td>\r\n9.6<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    [latex]{NO}_{3}^{-}[\/latex]<\/td>\r\n13<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
    \r\n\r\nSolution for Exercise 20<\/strong><\/span><\/a>\u2ba7\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. Use the periodic table at https:\/\/ptable.com\/#Properties<\/span><\/a>\u2197 to determine the atomic weight of each ion and enter the atomic weights in column C.<\/li>\n
    2. Use the atomic weight of each ion to convert the concentration from mg\/L to molarity (mmol\/L) and enter the answers in column D.<\/li>\n
    3. Enter the valence charge for each ion in column E.<\/li>\n
    4. Use the valence charge and values from column D 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>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{Mg}_{}^{2 +}[\/latex]<\/td>\n34<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{Na}_{}^{+}[\/latex]<\/td>\n8.2<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]K_{}^{+}[\/latex]<\/td>\n1.4<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{Fe(III)}_{}^{}[\/latex]<\/td>\n0.1<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{HCO}_{3}^{-}[\/latex]<\/td>\n325<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{SO}_{4}^{2 -}[\/latex]<\/td>\n84<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{Cl}_{}^{-}[\/latex]<\/td>\n9.6<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
      [latex]{NO}_{3}^{-}[\/latex]<\/td>\n13<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \n

      Solution for Exercise 20<\/strong><\/span><\/a>\u2ba7<\/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":103,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1370","chapter","type-chapter","status-publish","hentry"],"part":1522,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1370","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\/1370\/revisions"}],"predecessor-version":[{"id":1811,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1370\/revisions\/1811"}],"part":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/parts\/1522"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1370\/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=1370"}],"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=1370"},{"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=1370"},{"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=1370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}