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The Henderson–Hasselbalch equation allows pH to be derived from the quantity of H + using pKa, the negative log of the acid dissociation constant, in biological and chemical systems. In water, the absorption of H + and OH ‑ may vary over 15 orders of magnitude.
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An acidic solution contains a higher relative number of hydrogen ions conversely, alkaline solutions have a higher relative number of OH - ions.
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This is dependent on the comparative number of hydrogen ions (H +) or hydroxyl ions (OH -) in the solution. The pH is a measure of an aqueous solution’s acidity or alkalinity. Thus, the industrial applications of pH meters are huge, ranging from water conditioning to food production.
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Most products require a specific pH for activity or stability, especially in the food and beverage industry, cosmetic industry and pharmaceutical sector.
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