What is exactly the pH value of distilled water?

1.0
7.0
10.0
It depends on the temperature
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 water that has been exposed to air is mildly acidic, because it absorbs carbon dioxide from the air.
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Answers by country

1.0
7.0
10.0
It depends on the temperature
answers
flagPakistan
11%
50%
0%
38%
18
flagBelarus
0%
54%
9%
36%
11
flagGreece
14%
50%
0%
35%
14
flagUkraine
29%
33%
3%
32%
86
flagthe United States
11%
48%
7%
31%
154
flagIndia
3%
61%
4%
29%
147
flagAustralia
7%
67%
0%
25%
28
flagAustria
15%
53%
7%
23%
13
flagGermany
16%
50%
11%
22%
36
flagRussia
31%
36%
9%
22%
22
flagPoland
18%
53%
5%
21%
4353
flagthe United Kingdom
21%
56%
5%
16%
37