<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-893X</journal-id>
<journal-title><![CDATA[Educación química]]></journal-title>
<abbrev-journal-title><![CDATA[Educ. quím]]></abbrev-journal-title>
<issn>0187-893X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Química]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-893X2018000200003</article-id>
<article-id pub-id-type="doi">10.22201/fq.18708404e.2018.1.63702</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Coleção de propostas utilizando produtos naturais para a introdução ao tema ácido-base (parte II): extração e armazenamento]]></article-title>
<article-title xml:lang="en"><![CDATA[Set of proposals using natural products to introduce the acid-base theme (part II): extraction and storage]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Dirlei Badotti da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[Marcello de Mello]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kreve]]></surname>
<given-names><![CDATA[Yohanne Dangui]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nicolini]]></surname>
<given-names><![CDATA[Keller Paulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nicolini]]></surname>
<given-names><![CDATA[Jaqueline]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Federal do Paraná Departamento de Química ]]></institution>
<addr-line><![CDATA[Palmas ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Federal do Paraná Departamento de Ciências Biológicas ]]></institution>
<addr-line><![CDATA[Palmas ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Federal do Paraná  ]]></institution>
<addr-line><![CDATA[Palmas ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>3</fpage>
<lpage>16</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2018000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2018000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2018000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: Na Parte I da coleção de experimentos utilizando indicadores alternativos de pH, foram testados repolho roxo, beterraba, cebola roxa e berinjela. Na Parte II dessa coleção foi investigado o comportamento colorimétrico dos extratos de açafrão-da-terra (Curcuma sp.), coleus-de-Java (Solenostemon sp.), feijão-preto (Phaseolus sp.) e trapoeraba-roxa (Tradescantia sp.). Os extratos foram obtidos a partir da extração em meio aquoso, sendo monitorado o tempo de armazenamento de cada extrato e a coloração observada na presença de produtos do cotidiano dos estudantes, investigando assim o pH dos mesmos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Compounding the set proposals using alternative pH indicators from vegetables and leaves, in Part I purple cabbage, beet, purple onion and eggplant were tested. In this manuscript (Part II) was investigated, from products of students daily life, the behavior of extracts from saffron (Curcuma sp.), coleus-de-Java (Solenostemon sp.), black beans (Phaseolus sp.) and purple trapoeraba (Tradescantia sp.). The extracts were obtained from the aqueous medium extraction. The time storage of each extract and the coloration observed was monitored. These allow investigating the pH of the daily products using extracts from natural products.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Ensino de Química]]></kwd>
<kwd lng="pt"><![CDATA[Indicador de pH]]></kwd>
<kwd lng="pt"><![CDATA[Química Verde]]></kwd>
<kwd lng="pt"><![CDATA[Extração de Produtos Naturais]]></kwd>
<kwd lng="en"><![CDATA[Chemistry teaching]]></kwd>
<kwd lng="en"><![CDATA[pH Indicator]]></kwd>
<kwd lng="en"><![CDATA[Green Chemistry]]></kwd>
<kwd lng="en"><![CDATA[Natural Products Extraction]]></kwd>
</kwd-group>
</article-meta>
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