Friday, April 10, 2009

Ph vs. pH

Upper and lower case is often critical. In chemistry, the symbol Ph is frequently used to represent a phenyl group, whereas pH stands for potentium Hydrogenium (Latin for potential of hydrogen). The pH value of a solution measures its acidity or basicity. The quantity pH is dimensionless and defined as the negative value of the decimal logarithm of the hydrogen ion activity, aH, in an aqueous solution:

pH = -log10 aH

For pH details see: IUPAC Gold Book/pH quantity

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