Pure distilled water with a pH of 7 is in the middle of the scale. Anything that has a pH of 7 or lower is an acid, and anything that has a pH of 7 or higher is an alkali, or base.
What Is the pH of Distilled Water?
- A solution's pH serves as a gauge for the amount of hydrogen ions present.
- The phrase itself loosely refers to the "power of hydrogen," and it is the negative logarithm of the actual concentration of hydrogen ions.
- Accordingly, a pH difference of one unit corresponds to a tenfold change in hydrogen ion concentration, and hydrogen ion concentration falls as pH increases.
- Between 0 and 14 is the pH range. Acidic solutions fall within the pH range of 0 to 7, while basic solutions fall within the range of 7 to 14.
- As carbon dioxide from the environment is absorbed, pure distilled water, which should have a pH of 7, actually has a slightly acidic pH of 5.8.
pH = -log([H+]) = 3
pH = -log([H+]) - log (10-²) = 5.
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