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Which of these statements best explains why pure water has a pH of 7?

1) Pure water contains only H20 molecules, but pH is based on the concentration of H30+ ions.
2)Each molecule of water can dissociate to form 7 H30+ ions.
3) water self-ionizes to form an equilibrium system that has [H30+]=1.0x10^-7M

User AdamOutler
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2 Answers

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water self-ionizes to form an equilibrium system that has [h30+]=1.0*10^-7M

Your answer is C
User Slimbo
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A neutral solution would have a pH of 7, which means that the acid and base concentrations are equal. For the case of water, the concentrations of H3O+ and OH- are equal, which is 1.0 x 10^-7 M. Thus, the 3rd statement best explains the neutral pH of water.
User Antonyt
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