<?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>S0187-893X2024000200089</article-id>
<article-id pub-id-type="doi">10.22201/fq.18708404e.2024.2.86430</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Validación de la ecuación de Nernst y una ecuación que estima la masa de hidróxido de calcio para un determinado pH]]></article-title>
<article-title xml:lang="en"><![CDATA[Validation of the Nernst equation and an equation that estimates the mass of calcium hydrox- ide for a given pH]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranguri-Llerena]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huarcaya-Mendoza]]></surname>
<given-names><![CDATA[Nayhsa J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Trujillo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Trujillo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>35</volume>
<numero>2</numero>
<fpage>89</fpage>
<lpage>99</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2024000200089&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2024000200089&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2024000200089&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El hidróxido de calcio (Ca(OH)2) es usado en múltiples aplicaciones industriales y como modificador de pH. El objetivo del presente trabajo fue validar experimentalmente la ecuación de Nernst, usando disoluciones de Ca(OH)2 y desarrollar una sugerencia didáctica para la educación química, que permita encontrar la masa necesaria Ca(OH)2 que se debe adicionar a un determinado volumen de agua para alcanzar un pH requerido. Análisis de infrarrojo con transformada de Fourier (FTIR), difracción de rayos X (DRX) e imagen electrónica de barrido (SEM) se realizaron para caracterizar el Ca(OH)2. Los resultados de las pruebas a 27,5 °C ± 0,1 °C, muestran que al graficar los valores de pH experimental (pHe), potencial (E) y de conductividad contra las concentraciones de aniones hidroxilos [OH-] (semilogarítmico), siguen un mismo patrón, afectados por la baja solubilidad de Ca(OH)2 de tal forma que la última zona de las tres gráficas, tienden a ser paralelas al eje de las concentraciones de los [OH-]. Se generó la ecuación: E = 369,55 -58,914 pHe; donde 58,914 representa el valor de su pendiente, que equivale al 99,58% de la pendiente teórica de la ecuación de Nernst y se encontró una ecuación, que estima la masa de Ca(OH)2 que se debe adicionar a un volumen de agua, para alcanzar un pH requerido.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Calcium hydroxide (Ca(OH)2) is used in multiple industrial applications and as a pH modifier. This work aimed to experimentally validate the Nernst equation, using Ca(OH)2 dissolutions and to develop a didactic suggestion for chemical education, which allows finding the necessary mass of Ca(OH)2 that must be added to a certain volume of water to reach a required pH. Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron imaging (SEM) analyses were performed to characterize Ca(OH)2. The results of the tests at 27.5 °C ± 0.1 °C show that when plotting the values of pH experimental (pHe), potential (E) and conductivity against the concentrations of hydroxyl anions [OH-] (semilogarithmic), follow the same pattern, affected by the low solubility of Ca(OH)2 in such a way that the last zone of the three graphs tends to be parallel to the axis of the [OH-] concentrations. The equation was generated: E = 369.55 - 58.914 pHe; where 58.914 represents the value of its slope, which is equivalent to 99.58% of the theoretical slope of the Nernst equation and an equation was found that estimates the mass of Ca(OH)2 that must be added to a volume of water, to reach a required pH.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cal]]></kwd>
<kwd lng="es"><![CDATA[conductividad]]></kwd>
<kwd lng="es"><![CDATA[Ecuación de Nernst]]></kwd>
<kwd lng="es"><![CDATA[hidróxido de calcio]]></kwd>
<kwd lng="es"><![CDATA[pH]]></kwd>
<kwd lng="es"><![CDATA[potencial]]></kwd>
<kwd lng="en"><![CDATA[Lime]]></kwd>
<kwd lng="en"><![CDATA[conductivity]]></kwd>
<kwd lng="en"><![CDATA[Nernst equation]]></kwd>
<kwd lng="en"><![CDATA[calcium hydroxide]]></kwd>
<kwd lng="en"><![CDATA[pH]]></kwd>
<kwd lng="en"><![CDATA[potential]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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