{"id":534,"date":"2020-03-09T13:30:57","date_gmt":"2020-03-09T13:30:57","guid":{"rendered":"http:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/?p=534"},"modified":"2020-03-09T13:30:57","modified_gmt":"2020-03-09T13:30:57","slug":"pluja-acida-ph-productes-quotidians-que-hem-fet-que-hem-apres","status":"publish","type":"post","link":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/2020\/03\/09\/pluja-acida-ph-productes-quotidians-que-hem-fet-que-hem-apres\/","title":{"rendered":"Pluja \u00e0cida, pH productes quotidians. Qu\u00e8 hem fet? Qu\u00e8 hem apr\u00e8s?"},"content":{"rendered":"\n

PLUJA D\u2019OR:<\/strong><\/p>\n\n\n\n

  1. Objectiu<\/strong><\/li><\/ol>\n\n\n\n
    • Reproduir una reacci\u00f3n de precipitaci\u00f3n r\u00e0pidament i lentament. I observar les caracter\u00edstiques del solid formal. <\/li><\/ul>\n\n\n\n
      1. Material i Productes<\/strong><\/li><\/ol>\n\n\n\n
            PRODUCTES<\/strong><\/td>              INSTRUMENTAL<\/strong><\/td><\/tr>
        Vas de precipitats                      <\/td>      Nitrat de plom (II) (Pb(NO3<\/sub>)2<\/sub>)<\/td><\/tr>
        Matr\u00e0s aforat<\/td>        Iodur de potassi (KI)<\/td><\/tr>
        Tub d’assaig<\/td>        Aigua destil\u00b7lada (H2<\/sub>O)<\/td><\/tr>
        Proveta<\/td><\/td><\/tr>
        Embut de vidre<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        1. Procediment<\/strong><\/li><\/ol>\n\n\n\n

          <\/strong>Primer de tot has de preparar sobre el vas de precipitats o el matr\u00e0s les seg\u00fcents dissolucions:<\/p>\n\n\n\n

          \u00a01. Dissoluci\u00f3 en aigua de 20 ml de nitrat de plom amb una concentraci\u00f3n de 10 g\/L.
          2. Dissoluci\u00f3 de 40 ml de iodur de potassi amb una concentraci\u00f3 de 10 g\/L.<\/p>\n\n\n\n

          Despr\u00e9s aboca el  iodur de potassi sobre la dissoluci\u00f3 de nitrat de plom.  Observas com es forma un precipitat de color groc.<\/p>\n\n\n\n

          Despr\u00e9s escalfa el vas, pots utilitzar la meitat d’aquesta dissoluci\u00f3 o la tercera part, fins que el precipitat quedi dissolt.<\/p>\n\n\n\n

          Quan s’ha dissolt\u00a0 deixa refredar la dissoluci\u00f3 i observas com es va produint la pluja d’or.<\/p>\n\n\n\n

          Aboca sobre una proveta i observa el resultat.<\/p>\n\n\n\n

          e qualsevol color?<\/strong><\/p>\n\n\n\n

          • Perqu\u00e8 es formen petits s\u00f2lids amorfs que empedeixen la llum. <\/li><\/ul>\n\n\n\n

            Escriu la reacci\u00f3 qu\u00edmica ajustada que t\u00e9 lloc. \u00c9s una reacci\u00f3 reversible. Qu\u00e8 significa?<\/strong><\/p>\n\n\n\n

            2KI + Pb(NO3<\/sub>)2<\/sub> \u2192 PbI2<\/sub>\u2193 + 2KNO3<\/sub><\/p>\n\n\n\n

            Quan esclafem el producte, ens queden el reactius. <\/p>\n\n\n\n

            La pluja d\u2019or \u00e9s la cristal\u00b7litzaci\u00f3 del iodur de plom (II). En qu\u00e8 consisteix aquest fenomen?<\/strong><\/p>\n\n\n\n

            KI + PbI2<\/sub>\u2193 + KNO3<\/sub><\/p>\n\n\n\n

            1. Conclusi\u00f3<\/strong><\/li><\/ol>\n\n\n\n

              He apr\u00e9s\u00a0 que quan el atoms s\u2019ordenen en forma geom\u00e8trica brillen i es produeixen la cristal\u00b7listzaci\u00f3. Tamb\u00e9 que la\u00a0 reacci\u00f3 \u00e9s reversible i que hi ha procediments com la precipitaci\u00f3 per poder passar d\u2019una reacci\u00f3 s\u00f3lida amorfa .\u00a0<\/strong><\/p>\n\n\n\n

              <\/p>\n\n\n\n

              Mesura del pH:<\/strong><\/p>\n\n\n\n

              Subst\u00e0ncia<\/em><\/strong><\/td>Fenolftale\u00efna<\/em><\/strong><\/td>Taronja de metil<\/em><\/strong><\/td>Paper tornasol<\/em><\/strong><\/td>Sensor pH<\/em><\/strong><\/td>Car\u00e0cter<\/em><\/strong><\/td><\/tr>
              Aigua<\/strong><\/td>Transparent<\/td>Taronja<\/td>8<\/td>6,71<\/td>Neutre<\/td><\/tr>
              Suc de llimona<\/strong><\/td>Transparent<\/td>Taronja<\/td>3<\/td>3,37<\/td>\u00c0cid<\/td><\/tr>
              Coca cola<\/strong><\/td>Transparent<\/td>–<\/td>8<\/td>3,51<\/td>\u00c0cid<\/td><\/tr>
              Iogurt de llimona <\/strong><\/td>Transparent<\/td>Taronja<\/td>7<\/td>5,16<\/td>\u00c0cid <\/td><\/tr>
              Suc de fruites <\/strong><\/td>Transparent<\/td>Taronja<\/td>3<\/td>4,54 <\/td>\u00c0cid<\/td><\/tr>
              Vinagre<\/strong><\/td>Transparent<\/td>vermell<\/td>4<\/td>3,90<\/td>\u00c0cid<\/td><\/tr>
              Llet<\/strong><\/td>Transparent<\/td>Taronja<\/td>8<\/td>7,41<\/td>Neutre<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

              PLUJA D\u2019OR: Objectiu Reproduir una reacci\u00f3n de precipitaci\u00f3n r\u00e0pidament i lentament. I observar les caracter\u00edstiques del solid formal.  Material i Productes     PRODUCTES        …<\/p>\n","protected":false},"author":71,"featured_media":535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,38],"tags":[],"_links":{"self":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/posts\/534"}],"collection":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/users\/71"}],"replies":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/comments?post=534"}],"version-history":[{"count":1,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/posts\/534\/revisions"}],"predecessor-version":[{"id":536,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/posts\/534\/revisions\/536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/media\/535"}],"wp:attachment":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/media?parent=534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/categories?post=534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16maidaayyaz\/wp-json\/wp\/v2\/tags?post=534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}