eli5 Why is alkalinity expressed as percentage of Na2O (%Na2O)?
In: Chemistry
It is not. Three quotes from [Alkalinity](https://en.wikipedia.org/wiki/Alkalinity)
>Alkalinity is is the capacity of water to resist changes in pH that would make the water more acidic.
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It is measured by titrating the solution with a monoprotic acid such as HCl until its pH changes abruptly, or it reaches a known endpoint where that happens.
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>Alkalinity is expressed in units of meq/L (milliequivalents per liter), which corresponds to the amount of monoprotic acid added as a titrant in millimoles per liter.
The pH value is the basicity if is it alkaline solution and it is a logarithmic measurement of the number H+ ions. It is interconnected with the number of OH- ions.
Where have you got “**alkalinity expressed as percentage of Na2O (%Na2O)?”**
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