Question

What is exactly the pH value of distilled water?

Answer 1

Also, keep in mind that water (distilled, deionized, or tap) is NOT "pure" (i.e., pH equal to 7). The moment it comes in contact with air, CO2 gas begins dissolving into it, forming carbonic acid. The actual pH, therefore, will often be slightly less than 7.

Answer 2

heya folk!!

Pure water is about 7 at 25 °C; this value decreases with increasing temperatures. At 50 °C, it is 6.55. It is also worth to note, that waterthat has been exposed to air is mildly acidic, because it absorbs carbon dioxide from the air.

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