In pure water, the focus of the hydrogen H+ ion (hydronium H3O+ ion) is usually such as the concentration of the hydroxide OH- ion. In easy terminology, It's also stated the era of every single hydrogen H+ ion (hydronium H3O+ ion) equivalent ratio of hydroxide OH- ion is also generated https://invigoratedwaterreviews46677.blogoxo.com/17377183/the-5-second-trick-for-water-filter-definition