​By definition, pH is the negative logarithm of the hydrogen-ion concentration in aqueous solution. This means that a solution having a pH value of 4 has ten times more hydrogen ions than a solution whose pH is 5. For control systems neutralizing spent acids or bases, pH value per se is of little consequence except as a control point for the neutralization.

pdf icon Rosemount-Analytical-2011-Basics-Of-pH-Control.pdf

Rosemount Analytical (2011) Basics Of pH Control
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