Autor: Colégio Estadual Oliveira Botelho | Publicado: 2015-05-05T19:05:00-03:00

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Procedimento Operacional
  Padrão&nbsp; -&nbsp; POP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F-1&nbsp;&nbsp; 

   
   
    
    
    
    
    
    
    
    
    
    
    
    
   
   
   
  
   
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Turmas EM Regular e NEJA/Noturno&nbsp; &nbsp;&nbsp;

C.E.
  O.B.&nbsp;&nbsp;&nbsp;&nbsp; 2015/ 1º Bi



  


 

  
  
Introdução

  
  
Objetivo

  
  
Material
  Utilizado

  
  
Público
  Alvo

  
  
Conclusão

 

  
  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 

1-Introdução:&nbsp; O ph é o símbolo abreviado para a grandeza
  físico - química chamada "potencial hidrogeniônico". Na química, o
  ph é o número que indica se uma solução é ácida (ph<7 neutra="" o="" ph="7" rea="" span="" style="mso-spacerun: yes;">&nbsp; ,&nbsp;&nbsp; (&nbsp; &gt;7
  reação básica ou alcalina ), os valores variam de 0 a 14. O pH é uma
  característica de todas as substâncias, determinado pela concentração de íons
  de hidrogênio (H+). O ph de uma substância pode variar de acordo com sua
  composição, concentração de sais, metais, ácidos, bases, substâncias
  orgânicas e da temperatura.
  &nbsp;&nbsp;&nbsp;&nbsp; Medida de pH:
  Hoje em dia já existem vários aparelhos que permitem determinar o pH de uma
  determina solução, os chamados medidores electrónicos de pH, que são
  bastantes úteis e facilitam em muito o processo.




  
O
  pH&nbsp; pode ser determinado indiretamente
  pela adição de um indicador de pH na solução em análise. A cor do indicador
  varia conforme o pH da solução. Indicadores comuns são a fenolftaleína e o
  azul de bromotimol.

Outro
  indicador de pH muito usado em laboratórios é o chamado papel de tornassol (papel
  de filtro impregnado com tornassol). Este indicador apresenta uma ampla faixa
  de viragem, servindo para indicar se uma solução é nitidamente ácida (quando
  ele fica vermelho) ou nitidamente básica (quando ele fica azul).

Um
  indicador de pH alternativo é o sumo da couve-roxa (ou o caldo onde foi
  cozida), ficando vermelho em soluções ácidas e azul em soluções alcalinas.

Estando o pH do sangue abaixo da normalidade 7,4,
  o organismo está propenso a todos os tipos de doenças do coração, fadiga
  crônica, alergias além de doenças causadas por vírus, bactérias e fungos. Uma
  maneira de manter o pH saudável é evitar alimentos com pH baixo, como café
  (em torno de 4,0), refrigerante (em torno de 2,0), cerveja (varia de 2,5 a
  4,2 dependendo da marca).

O nosso
  corpo tenta a todo custo manter o pH sanguíneo com o valor de 7,4, extraindo
  minerais do organismo para manter o pH alcalino quando não é suprido pelos
  alimentos. O consumo indiscriminado de açúcar produz pH ácido.

A água considerada adequada para consumo, boa para
  a saúde, tem de ter um pH entre 7,0 e 7,5.

Um pH levemente alcalino do sangue aumenta a
  oxigenação das células e a imunidade, uma vez que, vírus e bactérias precisam
  de um meio ácido para sobreviver. Assim como o fogo precisa de oxigênio para
  existir, os vírus e bactérias necessitam de um meio ácido para se manterem
  vivos.



  
  
2-Objetivo:&nbsp; treinamento prático para verificação do pH em
  algumas substâncias.

 

  
  


3-Campo
  de Aplicação: conhecimento e experimentação&nbsp;
  de&nbsp; Biologia, química e Bioquímica.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;

 

  
  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  F-2

4-Principais
  Passos:&nbsp; saber utilizar os reagentes de
  titulagem e manusear os tubos de ensaios com segurança.

 

  
  


5-
  Cuidados Especiais:&nbsp; atenção na
  utilização do material de experimentos.





 

  
  


6-
  Material Utilizado: &nbsp;Tubos de ensaios,
  material para verificação do pH , o azul de bromotimol,

&nbsp;&nbsp;&nbsp; Fenolftaleina alcoólica 1%.&nbsp; Hidróxido de cálcio , vinagre e &nbsp;água.

 

  
  


7-
  Público&nbsp; Alvo:&nbsp; &nbsp;&nbsp;Ensino médio 



 

  
  
&nbsp;&nbsp; 

Conclusão:
  &nbsp;Essa atividade tem caráter educativo,
  instrutivo e despertativo &nbsp;para que os &nbsp;alunos &nbsp;&nbsp;&nbsp;&nbsp;se interessem&nbsp; a &nbsp;ingressarem na área &nbsp;técnica de química, técnico de Análises Clínicas,
  &nbsp;&nbsp;preparação para o SAERJ , vestibular
  e outros.





 

  
  
  
  
  
  
 




 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

 



 
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 






&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; GOVERNO
DO ESTADO DO RIO DE JANEIRO

&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SECRETARIA DE ESTADO DE EDUCAÇÃO&nbsp;&nbsp; -&nbsp;
CEOB 2015

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Biologia/Química/
Roseny Faulstich

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