Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/storage/2/bd/24/nacional/public_html/fotos/piwigo/include/functions.inc.php on line 500

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/storage/2/bd/24/nacional/public_html/fotos/piwigo/include/functions.inc.php on line 500

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/storage/2/bd/24/nacional/public_html/fotos/piwigo/include/functions.inc.php on line 500

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/storage/2/bd/24/nacional/public_html/fotos/piwigo/include/functions.inc.php on line 500
Comentários de usuário | Apenas outra galeria Piwigo.

Apenas outra galeria Piwigo.

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  • nacional_fotos - Terça-feira 11 novembro 2014 17:06
    Escala de pOH

    0 - < 7 7 > 7 - 14

    bases pOH neutro ácidos

    Os valores de pH e pOH somados resultam 14, ou seja:

    pH + pOH : 14.

    Ka (ácido)

    Kb (base)
  • nacional_fotos - Terça-feira 11 novembro 2014 17:03
    pH

    pH é a sigla para potencial hidrogeniônico.

    PH é o log negativo de base 10 da concentração molar de íons hidrogênio ( H+ )

    pH: - log [ H+]

    por exemplo a concentração molar por litro do suco gástrico é: [10 –1] mol/l

    assim , qual seria seu pH ?

    pH : - log [ H+]

    pH : - log [ 10-1]

    O pH do suco gástrico é 1.

    pOH

    pOH é o símbolo para potencial hidroxiliônico.

    Para encontrar o valor do pOH , calculamos o valor do logaritmo negativo de base 10 da concentração molar de hidroxilas [OH-] da solução.

    pOH: - log [OH-]