which of these statements best explains why pure water has a ph of 7?\npure water contains only h₂o…
which of these statements best explains why pure water has a ph of 7?\npure water contains only h₂o molecules, but ph is based on the concentration of h₃o⁺ ions.\neach molecule of water can dissociate to form 7 h₃o⁺ ions.\nwater self - ionizes to form an equilibrium system that has h₃o⁺=1.0×10⁻⁷ m.\ndone
Answer
Brief Explanations:
The pH of a solution is calculated as -log[H₃O⁺]. In pure water, self - ionization occurs: 2H₂O ⇌ H₃O⁺ + OH⁻, and at 25°C, the equilibrium concentration of H₃O⁺ is 1.0×10⁻⁷ M. Using the pH formula, pH = -log(1.0×10⁻⁷) = 7.
Answer:
Water self-ionizes to form an equilibrium system that has [H₃O⁺]=1.0×10⁻⁷ M.