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7 June, 05:37

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

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Answers (2)
  1. 7 June, 07:16
    0
    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.
  2. 7 June, 08:35
    0
    Water self-ionizes to form an equilibrium system that has [h30+]=1.0*10^-7M

    Your answer is C
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Home » Chemistry » 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.
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