viernes, 5 de abril de 2013

pH básico.

Indicateur de ph
Indicateur de ph (Photo credit: Wikipedia)
English: A pH scale with annotated examples of...
English: A pH scale with annotated examples of chemicals at each integer pH value. (Photo credit: Wikipedia)
Global variation in soil pH. Red = acidic soil...
Global variation in soil pH. Red = acidic soil. Yellow = neutral soil. Blue = alkaline soil. Black = no data. (Photo credit: Wikipedia)
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