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Pure water has a pH of 7?

Updated: 8/11/2023
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13y ago

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Yes and no.

Pure water at 25°C has a pH of 7.0. However, water autoionises, that is splits into H+ (in the form of H3O+) and OH- spontaneously. This process is accelerate by increased temperature, that is, occurs more readily at higher temperature.

Therefore at a higher temperature there will me more H+ and OH- in solution (always in equal proportions).

As pH is a measure of the amount of H+ in solution, as the temperature increases, the pH will lower (lower pH means more H+).

i.e. at 37°C the pH of pure water, the same water as above, will be 6.81.

This water will not be acidic though, as the OH- concentration has increased by the same amount, it's just that pH only measures the pH concentration.

Conversely, cool the water, and the pH will go up, 7+ for same reasons.

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13y ago
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13y ago

NO, digestive acid is an acid

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