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PH

Valor que indica el grado de acidez o alcalinidad de una solución y que se define como el logaritmo de la concentración de iones hidrógeno en gramos por litro. La escala de pH que adscribe al agua el valor neutro 7 es la siguiente: 0-2 muy ácido 3-4 ácido 5-6 ligeramente ácido 7 neutro 8-9 ligeramente alcalino 10-11 alcalino y 12-14 muy alcalino. En fotografía el pH cobra importancia sobre todo en relación con el revelador que casi siempre funciona mejor en un medio alcalino

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