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The Collaborative International Dictionary
Alkalinity

Alkalinity \Al`ka*lin"i*ty\, n. The quality which constitutes an alkali; alkaline property.
--Thomson.

Wiktionary
alkalinity

n. (context chemistry English) The state of being, or the degree to which a thing is, alkaline.

WordNet
alkalinity

n. pH values above 7 [ant: acidity]

Wikipedia
Alkalinity

Alkalinity is the name given to the quantitative capacity of an aqueous solution to neutralize an acid. Measuring alkalinity is important in determining a stream's ability to neutralize acidic pollution from rainfall or wastewater. It is one of the best measures of the sensitivity of the stream to acid inputs. There can be long-term changes in the alkalinity of streams and rivers in response to human disturbances.

Alkalinity is related to the pH of a solution, (its basicity) but measures a different property. Roughly, the pH of a solution is a measure of how "strong" the bases are in a solution, whereas the Alkalinity measures the "amount" of chemical bases. A good example is a buffer solution, which can have many available bases (high alkalinity) despite having only a moderate pH level.

Usage examples of "alkalinity".

Moreover, it is but little affected by variations in alkalinity, which render the other finishing point quite useless.

The less pure samples will show an excess of alkalinity because of the presence of sodium carbonate or of potassium carbonate.

In systematic assays of this kind, the alkalinity would no doubt be generally in excess of that required by the cyanide present: there would be no inconvenience in recording such excess in terms of potassium cyanide.

If this is not noticed it indicates that the vat is deficient in alkalinity, and a little more lime should be added.

Using a test strip he monitored the pH and alkalinity of the pool and set to work preparing the liquid shock and an algaecide, then switched on the pump.

Alkalinity from overirrigation had made the outermost reaches of the Kizyl-Kum (“Red Sand”) Desert look as if the Creator had poured the contents of a giant salt shaker over it and then added some ground chalk for good measure.