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
flagFrance
0%
36%
0%
63%
11
flagGreece
14%
29%
0%
55%
27
flagBelarus
0%
42%
14%
42%
14
flagAustralia
5%
59%
0%
35%
37
flagPakistan
7%
55%
0%
37%
27
flagthe United States
12%
45%
6%
35%
182
flagUkraine
26%
31%
4%
35%
148
flagthe Philippines
0%
57%
7%
35%
14
flagCanada
8%
58%
0%
33%
12
flagIndia
2%
61%
3%
31%
194
flagNigeria
3%
66%
3%
27%
33
flagthe United Kingdom
16%
54%
4%
24%
62
flagPoland
18%
52%
5%
23%
5006
flagGermany
10%
62%
4%
22%
124
flagRussia
31%
37%
6%
20%
48
flagSwitzerland
18%
63%
0%
18%
11
flagAustria
16%
64%
4%
16%
25
flagRepublic of Ireland
20%
60%
10%
10%
10
flagKazakhstan
36%
36%
18%
9%
11