CHUVA ÁCIDA 2
Autor: Augusto | Publicado: 2015-02-15T22:57:00-02:00


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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A
chuva ácida é caracterizada por um pH abaixo de 4,5. É causada pelo enxofre
proveniente das impurezas da queima dos combustíveis fósseis e pelo nitrogênio
do ar, que se combinam com o oxigênio para formar dióxido de enxofre e dióxido
de nitrogênio. Estes se difundem pela atmosfera e reagem com a água para formar
ácido sulfúrico e ácido nítrico, que são solúveis em água. Um pouco de ácido
clorídrico também é formado.



&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A
denominação chuva ácida é concedida
a toda chuva que possui um valor de pH
abaixo de 4,5 unidades. Esta acidez da chuva é causada pela solubilização de
alguns gases presentes na atmosfera terrestre
cuja hidrólise seja ácida.
Entre estes destacam-se os gases contendo enxofre, proveniente das
impurezas da queima dos combustíveis fósseis.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; As
chuvas normais têm um pH
de, aproximadamente, 5,6 unidades, que é levemente ácido. Essa acidez natural
é causada pela dissociação do dióxido de carbono em
água, formando um ácido fraco,
conhecido como ácido
carbônico, segue a reação:




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<![endif]--><!--[if gte mso 10]>

 /* Style Definitions */
 table.MsoNormalTable
 {mso-style-name:"Tabela normal";
 mso-tstyle-rowband-size:0;
 mso-tstyle-colband-size:0;
 mso-style-noshow:yes;
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 mso-style-qformat:yes;
 mso-style-parent:"";
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 font-size:11.0pt;
 font-family:"Calibri","sans-serif";
 mso-ascii-font-family:Calibri;
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 mso-hansi-font-family:Calibri;
 mso-hansi-theme-font:minor-latin;
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 mso-bidi-theme-font:minor-bidi;}

<![endif]-->



CO2(g) + H2O(l)&nbsp;
à H2CO3(aq)