What ions are formed during self-ionization of water?

H₃O + and OH-
HO₂- and H₂O
OH + and H₃O-
All answers are correct
The self-ionization of water is an ionization reaction in pure water or in an aqueous solution, in which a water molecule, H2O, deprotonates to become a hydroxide ion, OH−. The hydrogen nucleus, H+, immediately protonates another water molecule to form hydronium, H3O+. It is an example of autoprotolysis, and exemplifies the amphoteric nature of water.
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Answers by country

H₃O + and OH-
HO₂- and H₂O
OH + and H₃O-
All answers are correct
answers
flagGhana
89%
5%
5%
0%
19
flagthe United Arab Emirates
63%
18%
0%
18%
11
flagNigeria
61%
13%
6%
17%
86
flagthe Netherlands
53%
0%
26%
13%
15
flagSingapore
53%
7%
23%
15%
13
flagIndia
52%
12%
14%
20%
545
flagPakistan
50%
14%
16%
16%
48
flagMalaysia
46%
14%
7%
25%
28
flagSwitzerland
45%
16%
16%
22%
31
flagAustralia
44%
31%
9%
12%
74
flagAustria
43%
23%
5%
23%
76
flagCanada
41%
12%
20%
20%
24
flagGermany
36%
21%
19%
19%
440
flagthe United Kingdom
36%
20%
9%
31%
132
flagPoland
35%
16%
13%
33%
4070
flagthe United States
34%
20%
12%
31%
238
flagthe Philippines
32%
23%
18%
25%
43
flagSouth Africa
27%
36%
9%
27%
11
flagRepublic of Ireland
25%
33%
0%
33%
12
flagGreece
6%
26%
20%
46%
15