EduNinja

Edexcel IAL Chemistry A2 14.10 Ionic product of water, Kw

Edexcel IAL Chemistry A2 14.10 Ionic product of water, Kw
Pearson Edexcel IAL Chemistry syllabusChemistry YCH11First assessment 2019

For pure water, set [H+] equal to [OH-], use the given Kw to estimate pH and explain the lower pH through endothermic water dissociation.

How this is tested

  • Use Kw = [H+][OH-] with [H+] = [OH-] to estimate the pH of pure water.
  • Explain that higher temperature increases [H+] because water dissociation is endothermic.
  • State that pure water remains neutral when [H+] and [OH-] are still equal.